Technical has to be highest. The guy who can hit the ball harder, more accurately, and more consistently will usually win.
Physical has to be pretty high. Speed around the court to defend and ability to set up for shots for offense is important, but you don't have to be a physical specimen. McEnroe was quick, and Laver was extremely fit and quick, but not physically overpowering.
Mental strength is important, as well as tactics, but only if the players are pretty evenly matched to begin with.
technical at 80
Physical at 60
Tactical at 35
Mental at 25
I've turned a 50,50,50,50 Challenger player into someone like Monfils.