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Trainer Comparison

Statistics by Year:
Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 9 82 9.11 5 9 6 6.1% 24.39% $117,153 $1,429 $13,017 0 0
Leonard M. Slager 1 8 8 0 1 2 0% 37.5% $14,370 $1,796 $14,370 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 12 78 6.5 5 11 11 6.41% 34.62% $123,074 $1,578 $10,256 0 0
Leonard M. Slager 8 28 3.5 1 5 5 3.57% 39.29% $100,100 $3,575 $12,513 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 13 100 7.69 10 24 17 10% 51% $247,312 $2,473 $19,024 0 0
Leonard M. Slager 12 102 8.5 9 13 12 8.82% 33.33% $168,645 $1,653 $14,054 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 17 67 3.94 2 6 10 2.99% 26.87% $51,947 $775 $3,056 0 0
Leonard M. Slager 11 55 5 11 5 7 20% 41.82% $187,684 $3,412 $17,062 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 22 148 6.73 9 23 20 6.08% 35.14% $160,930 $1,087 $7,315 0 0
Leonard M. Slager 17 114 6.71 8 8 13 7.02% 25.44% $139,404 $1,223 $8,200 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 29 216 7.45 14 20 31 6.48% 30.09% $199,110 $922 $6,866 0 0
Leonard M. Slager 16 106 6.63 9 10 10 8.49% 27.36% $151,287 $1,427 $9,455 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 30 202 6.73 18 29 20 8.91% 33.17% $225,682 $1,117 $7,523 0 0
Leonard M. Slager 30 115 3.83 9 18 13 7.83% 34.78% $148,782 $1,294 $4,959 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 31 252 8.13 16 24 37 6.35% 30.56% $258,751 $1,027 $8,347 0 0
Leonard M. Slager 32 246 7.69 23 16 29 9.35% 27.64% $282,374 $1,148 $8,824 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 34 260 7.65 24 26 33 9.23% 31.92% $281,642 $1,083 $8,284 0 0
Leonard M. Slager 33 204 6.18 20 29 20 9.8% 33.82% $244,880 $1,200 $7,421 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 21 188 8.95 23 22 28 12.23% 38.83% $255,047 $1,357 $12,145 0 0
Leonard M. Slager 11 70 6.36 8 10 11 11.43% 41.43% $124,158 $1,774 $11,287 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 37 248 6.7 32 27 35 12.9% 37.9% $353,112 $1,424 $9,544 0 0
Leonard M. Slager 14 81 5.79 6 13 13 7.41% 39.51% $125,674 $1,552 $8,977 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 33 222 6.73 20 23 29 9.01% 32.43% $234,272 $1,055 $7,099 0 0
Leonard M. Slager 7 44 6.29 11 6 2 25% 43.18% $120,766 $2,745 $17,252 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 32 210 6.56 20 18 23 9.52% 29.05% $239,430 $1,140 $7,482 0 0
Leonard M. Slager 10 37 3.7 5 3 3 13.51% 29.73% $66,506 $1,797 $6,651 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 33 183 5.55 18 25 22 9.84% 35.52% $239,526 $1,309 $7,258 0 0
Leonard M. Slager 10 42 4.2 3 3 4 7.14% 23.81% $62,615 $1,491 $6,262 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 38 260 6.84 24 32 27 9.23% 31.92% $336,926 $1,296 $8,866 0 0
Leonard M. Slager 17 47 2.76 2 2 1 4.26% 10.64% $34,010 $724 $2,001 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 51 256 5.02 26 32 45 10.16% 40.23% $379,217 $1,481 $7,436 0 1
Leonard M. Slager 16 37 2.31 3 3 3 8.11% 24.32% $31,363 $848 $1,960 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 46 232 5.04 30 34 25 12.93% 38.36% $381,813 $1,646 $8,300 0 0
Leonard M. Slager 17 72 4.24 1 5 9 1.39% 20.83% $41,200 $572 $2,424 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 27 191 7.07 17 17 35 8.9% 36.13% $251,299 $1,316 $9,307 0 0
Leonard M. Slager 21 64 3.05 6 4 10 9.38% 31.25% $70,569 $1,103 $3,360 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 29 214 7.38 18 14 26 8.41% 27.1% $258,618 $1,208 $8,918 0 1
Leonard M. Slager 13 77 5.92 5 11 7 6.49% 29.87% $82,166 $1,067 $6,320 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 35 223 6.37 27 18 38 12.11% 37.22% $553,363 $2,481 $15,810 0 2
Leonard M. Slager 11 18 1.64 0 3 1 0% 22.22% $13,290 $738 $1,208 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 0 0 0 0 0 0 0% 0% $0 $0 $0 0 0
Leonard M. Slager 2 3 1.5 0 0 0 0% 0% $705 $235 $353 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 1 2 2 1 0 0 50% 50% $1,860 $930 $1,860 0 0
Leonard M. Slager 6 30 5 1 4 4 3.33% 30% $17,446 $582 $2,908 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 3 18 6 4 4 2 22.22% 55.56% $13,133 $730 $4,378 0 0
Leonard M. Slager 7 35 5 0 3 3 0% 17.14% $8,875 $254 $1,268 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 0 0 0 0 0 0 0% 0% $0 $0 $0 0 0
Leonard M. Slager 13 75 5.77 3 6 5 4% 18.67% $29,051 $387 $2,235 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Donna Bireta 12 84 7 7 11 13 8.33% 36.9% $64,836 $772 $5,403 0 0
Leonard M. Slager 14 79 5.64 3 2 7 3.8% 15.19% $22,464 $284 $1,605 0 0