Tennis-Round-up of Day Eight at Wimbledon

July 4 (Reuters) - Round-up of news from the eighth day of Wimbledon on Monday (all times GMT): MURRAY DOWNS KYRGIOS IN STRAIGHT SETS Second Seed Andy Murray of Britain, the new favourite for the tournament following the departure of top seed Novak Djokovic beat volatile Australian 15th seed Nick Kyrgios 7-5 6-1 6-4. Murray downs mercurial Kyrgios to reach quarter-finals TSONGA INTO LAST EIGHT AFTER GASQUET RETIRES HURT Jo-Wilfried Tsonga won his fourth-round match when his fellow Frenchman Richard Gasquet retired with a back injury with the score at 4-2 in the first set. He meets Murray in the quarter-finals. Tsonga confident he can beat Murray in last eight VENUS JOINS SISTER IN QUARTER-FINALS Eighth seed Venus Williams reached the last eight with a 7-6(3) 6-4 victory over Spain's Carla Suarez Navarro, the 12th seed. Venus strides into quarter-finals despite early scare SERENA POWERS THROUGH TO LAST EIGHT Top seed Serena Williams beat Russia's Svetlana Kuznetsova, the 13th seed, 7-5 6-0 to advance to the quarter-finals. Serena powers into Wimbledon quarter-finals THIRD SEED RADWANSKA LOSES TO CIBULKOVA IN TOUGH THREE SETS Dominka Cibulkova beats Agnieszka Radwanska for second time in two weeks to reach quarters and may have to postpone wedding. She won 6-3 5-7 9-7.. Cibulkova wedding plans uncertain after win over Radwanska ROGER FEDERER CALMLY THROUGH Third seed Roger Federer made the quarter-finals by beating American Steve Johnson 6-2 6-3 7-5 in the fourth round. Roger that! Federer stays on track at Wimbledon FIFTH SEED NISHIKORI QUITS INJURED, CILIC INTO QUARTERS Marin Cilic reached the Wimbledon quarter-finals for the third year running after Kei Nishikori quit with a rib injury midway through their fourth-round match on Monday. Luckless Nishikori faces injury deja vu at Wimbledon AMERICAN QUERREY CRUISES INTO QUARTER-FINALS Sam Querrey of the United States, the 28th seed and the man who put out Novak Djokovic on Saturday, beat Nicolas Mahut of France 6-4 7-6(5) 6-4 to reach the quarter-finals. Fluke fears drive giant-killer Querrey into quarter-finals Djokovic demise finally gives 'hope to the hopeless' HALEP DOWNS KEYS TO MOVE INTO QUARTERS After losing the first set, Romania's Simona Halep, the fifth seed, rallied to beat ninth seed Madison Keys of the United States 6-7(5) 6-4 6-3. Wily Halep hits back to beat hobbling Keys (Reporting by Ian Rodricks in Bengaluru, editing by Ed Osmond, Ken Ferris and Clare Lovell)