Paris: Big-serving American John Isner fired down 27 aces to stun Roger Federer and reach the quarter-finals of the Paris Masters on Thursday night. Isner won 7-6 (7/3), 3-6, 7-6 (7/5) for just his second career win over the Swiss legend and first on a hardcourt.

Roger Federer waves to fans after losing to John Isner in the Paris Open pre-quarters on Thursday