Roger Federer's thrilled with the way his knee is performing in his return to tennis.

The 17 times grand slam champ had knee surgery six weeks ago.

He's won through to the quarter finals of the Monte Carlo Masters with a straight sets win over Auckland's ASB Classic champion Roberto Bautista Agut.

Federer says he's getting closer to the peak in the sense of maximum movement against the best players on a tough surface so feels he's in a great place.

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Eight times Monte Carlo champ Rafael Nadal and second seed Andy Murray are also through to the quarters.