Sunday’s final will see the exciting tie of McEnroe against Mats Wilander, who saw off Henri Leconte 6-2 7-6(2) earlier in the day.
Forget replaced Andy Murray’s coach Ivan Lendl at the last minute after the former world number one was forced to pull out due to his knee and hip injury.
On Thursday, McEnroe beat Jeremy Bates 6-4 6-1, in what is his favourite ATP Champions Tour event and now sees an older ‘Legends’ tournament, alongside Pat Cash, Henri Leconte, Mats Wilander and others.
The win was sweet revenge for McEnroe, who four years ago lost 11-9 in a final set champions’ tie-break to Bates and decided at the time to bow out of the tournament for good.
Despite being an older 'Legend' than his last shot at the event, he is happy with how his body is holding up.
“Unbelievably well. I don't feel a day over 52,” said the 53-year-old.
Earlier in the day, former world number one and current South African Airways rankings leader, Carlos Moya, lost to Australian Mark Philippoussis in a closely fought third-set tie-break (4-6 6-1 10-8).
This was Moya’s Masters debut, and Philippoussis was his closest challenger in the rankings.
Saturday will see Moya face Fabrice Santoro, while Guy Forget will play Jeremy Bates for third place.