He must be betting a lot of "any other result" lines like the ones below. Hell, even I can hit 75% on Lines that are -5000.
Sat 5/7 127 Mosley wins by split decison
+3500 11:00PM 128 Any other result -10000 Sat 5/7 129 Mosley wins by majority decision
+10000 11:00PM 130 Any other result -32000 Sat 5/7 131 Pacquiao wins by unanimous decision
+230 11:00PM 132 Any other result -310 Sat 5/7 133 Pacquiao wins by split decision
+1325 11:00PM 134 Any other result -2675 Sat 5/7 135 Pacquiao wins by majority decision
+4500 11:00PM 136 Any other result -14000 Sat 5/7 137 Mosley/Pacquiao unanimous draw
+20000 11:00PM 138 Any other result -60000 Sat 5/7 139 Mosley/Pacquiao split decision draw
+7000 11:00PM 140 Any other result -18500 Sat 5/7 141 Mosley/Pacquiao majority draw
+12000 11:00PM 142 Any other result -36000 Sat 5/7 143 Mosley/Pacquiao technical draw
+13000 11:00PM 144 Any other result -65000