With help from $100,000 of a Wimbledon windfall, Dave Miley has been running for president of the International Tennis Federation, meeting and greeting people around the world and watching the bank balance count down.

“It’s like a taxi ride with the meter going: tick, tick, tick,” Miley said in an interview in New York this month. “My account has gone to 80 to 70 to 60 to 40, but it’s O.K. I’m 60 years old. You think I’m going to be worried about this in 20 years’ time? I’m happy to be alive, and you know what? I believe I can win.”

Miley, an Irishman who said he has visited 70 countries during his campaign, will find out if his hunch is correct on Friday, when the I.T.F. votes for president at its annual general meeting in Lisbon.

The incumbent is David Haggerty, an American who has engineered major changes to the I.T.F.’s main team competitions, Davis Cup and Fed Cup, since being elected to a four-year term in September 2015.