Online gambling exchange Betfair told The Associated Press Friday that Tuesday's match attracted an unusual $1.5 million in wagers and was the subject of dramatic price movement.
Bloomfield, of Britain, won the match 7-6 (1), 6-3.
Bloomfield, ranked No. 552, was rated even money against his 160th-ranked Belgian opponent. In the hours before the match, the odds on Bloomfield winning shortened to 1-4. After he won the first set, the odds shorted to 1-8.
"If people are willing to risk 4 pounds to win one, that is indicative of a substantial gamble," Betfair spokesman Tony Calvin said.