be at the top of your game , auch: be at the top of one's game
be on top of your game , auch: be on top of one's game

"We got three or four guys that are really not on top of their game."

"But we were playing a team that was on top of their game."

But it will not go long if Jones is on top of his game.

It goes back to when he was on top of his game.

I was definitely not on top of my game today.

A woman coach, she's going to be on top of her game.

We've just got to be on top of our game.

"The other guys did a great job getting me the ball, and I was on top of my game today."

I'd be lying if I said he was on top of his game tonight.

To beat them, you need to be on top of your game.