The Swiss legend takes on Zverev in his second ATP World Tour Finals match looking to build on his opening win over Jack Sock.
And the prize money available for a victory would see him eclipse Tiger Words in the individual sports prize money charts.
A 14-time major winner, Woods has currently racked up an incredible $ 110,061,012 (£83,910,516) in winnings on the golf course.
But victory at the O2 this evening would take Federer to $ 110,235,682 (£84,010,613) and above Woods.
Federer recently moved ahead of Novak Djokovic in the tennis charts as he surpassed the Serb’s $ 109,805,403 (£83,715,639) total to become the sport’s biggest earner.
Federer is far from guaranteed a win over the German though with Zverev being only one of four men to have beaten him in 2017.
However, Sky Sports pundit Leif Shiras fears Zverev doesn’t have the energy levels required to keep up with the eight-time Wimbledon champion.
“I’m not sure Zverev’s energy levels are up to the task because Roger is so good at being able to put the ball in places where guys can’t get comfortable,” said Shiras.
“Federer will be able to get Zverev in positions off the court where the forehand isn’t doing as much damage and he won’t be able to hurt him as much.”