NEW YORK (Reuters) - Serena and Venus Williams, the sisters with 29 grand slams and a stack of records between them, will try to maintain a collision course at the U.S. Open on Monday when they play their fourth-round matches.

Sept 5 (Gracenote) - Results from the U.S. Open Men's Singles Round 4 matches on Sunday

NEW YORK (Reuters) - Angelique Kerber won a battle of grand slam champions when the second seed powered her way into the quarter-finals of the U.S. Open on Sunday with a 6-3 7-5 win over Petra Kvitova.

NEW YORK (Reuters) - Lucas Pouille was not prepared to say his pulsating four hour, fourth-round upset of 14-time grand slam winner Rafa Nadal at the U.S. Open on Sunday was a career changing moment.

NEW YORK (Reuters) - Rafa Nadal said he was sad to have squandered an opportunity to do something special at the U.S. Open with his fourth-round loss at Flushing Meadows, but happy with his effort and prospects going forward this season.

Sept 4 (Reuters) - Latest news from the seventh day of the U.S. Open tennis championships on Sunday (all times GMT):

Sept 5 (Gracenote) - Results from the U.S. Open Women's Singles Round 4 matches on Sunday

NEW YORK, Sept 4 (Reuters) - Lucas Pouille crowned a glorious French charge at the U.S. Open on Sunday by ousting 14-times grand slam singles winner Rafa Nadal in a five-set thriller.

NEW YORK (Reuters) - Young Frenchman Lucas Pouille scored a stunning, five-set upset over 14-times grand slam singles champion Rafa Nadal, winning a climactic tiebreak 8-6 to reach the U.S. Open quarter-finals on Sunday.