Fed through to last four

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Roger Federer is through to his 20th consecutive grand-slam semi-final after a comfortable straight-sets victory over France's Gael Monfils.

The Swiss, bidding to claim his first Roland Garros title and complete his haul of all four Majors, won 7-6 6-2 6-4 win on Philippe Chatrier court.

Federer looked much more in control of his game compared to two days ago, when he had to come back from two sets and 4-3 down to defeat Germany's Tommy Haas.

His forehand was back working, his error count was lower and although 11th seed Monfils gave him a decent workout, the contest never lived up to the pre-match hype.

Federer, a 13-time grand-slam winner, was forced to save break points in the first and 11th games as an evenly-fought first set went to a tie-break.

After two mini-breaks each, Federer clinched it when he swatted home a forehand volley at the end of a riveting rally.

Consistent

The former world number one, a four-set winner over Monfils in the 2008 semi-finals here, was even more consistent in the 28-minute second set.

Again his forehand and serve were hitting the spot and he broke twice to take the set and leave an off-key Monfils with a mountain to climb.

The Frenchman called for the doctor prior to the start of the third set, a stomach problem appearing to be the issue. The same doctor would be summoned again at the end of the third game, with the set going with serve with Monfils 2-1 ahead.

The atmosphere by now was somewhat stale and Federer gradually applied the pressure. In game nine, Monfils saved a first break point but on the second the remaining French hope in the men's singles slammed a forehand into the net.

That proved decisive and Federer held comfortably in the next to ease to only his second straight-sets victory this tournament.

He will now meet Juan Martin del Potro in the last four knowing that not only has no-one left in the draw beaten him on clay, but also that his arch-rival Rafael Nadal - toppled in the fourth round - can no longer prevent him winning the title.