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The Tennis Integrity Unit quickly began its investigation into former world No. 13 Alexandr Dolgopolov’s straight-sets defeat against Thiago Monteiro at the Winston-Salem Open on Sunday after some bookies suspended betting activities, with a suspicious amount of money being wagered on Monteiro. Monteiro, ranked No. 114 in the world, beat No. 63 Dolgopolov 6-3, 6-3...