Nigel Willerton found himself in front of the Culture, Media and Sport committee of the House of Commons where MPs, following the lead of an investigation by the BBC and BuzzFeed made public before the recent Australian Open, grilled him on tennis's fight against cheats.
Tennis's various governing bodies have set up an independent inquiry into its anti-corruption practices.
Willerton said the TIU had received 246 alerts of suspicious betting patterns surrounding matches in 2015, up from 91 in 2014.
However, Willerton insisted an alert is not of itself evidence of corruption and that the figures had to be seen against a backdrop of some 120,000 professional tennis matches in a year.
However, he said: "It's far too many. We are concerned and that's why we have gone for an independent review."
This month saw the International Tennis Federation (ITF) announce that two umpires had been banned for corruption and four more were currently suspended while under investigation.
Most of the 19 players and officials sanctioned by the TIU since its creation in 2008 have been operating at the lower levels of the sport, where both financial rewards and media scrutiny are nothing like as great as compared to the top-flight of the game.
As if to emphasise that point, Willerton said only five grand slam matches over the past three years had prompted alerts, none of them at Wimbledon.
Willerton denied allegations that tennis authorities were reluctant to go after higher-profile players because of possible ensuing bad publicity.
He added that the numbers of TIU staff would increase from six to eight while saying that the unit only had a current budget of $2 million a year -- less than the $3.3 million received by each of last year's US Open singles winners.
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