Roger Federer saved two match points to defeat Gael Monfils and reach the Madrid Open quarter-finals on Thursday but women's world number one and top seed Naomi Osaka was dumped out in a last-eight shock.

Halle Westfalen, Germany - World number one Roger Federer kept his quest for a 10th Halle grasscourt title alive by saving two match points to defeat France's Benoit Paire 6-3, 3-6, 7-6 (9/7) and make the quarter-finals on Thursday.