Quick exit from Cincy no sweat for Zverev

CINCINNATI - Alexander Zverev enters the US Open brimming with confidence - even after a fatigue-filled loss in his ATP Cincinnati Masters opener on Wednesday.

Wildcard Frances Tiafoe of the US beat the seventh-ranked German 4-6, 6-3, 6-4 in a second-round matchup at the year's last major tuneup for the Open, which begins on Aug 28.

Zverev won titles at Montreal and Washington, giving him five for the year, matching Wimbledon and Australian Open champion Roger Federer for the ATP's most in 2017 after beating the 19-time Grand Slam winner in the Montreal final.