( CNN ) -- Serena Williams maintained her dominance of Denmark 's former world number one Caroline Wozniacki with a typical fightback in the quarterfinals of the Rogers Cup in Montreal . Williams has only lost once to Wozniacki in eight meetings , back in 2012 , but looked in danger of a rare defeat when she trailed a set and 4-2 . The world number one fell 15-30 on her next service game before hammering home one of her 15 aces of the day on the way to a run of 10 straight points to level at 4-4 . A further break of service saw Williams take the second set and she led 2-0 and 4-2 in the decider . Wozniacki , who was playing some of her best tennis of the year , twice leveled but the top seed pulled ahead again to close out the match 4-6 7-5 7-5 in two hours 41 minutes . It was to set up a semifinal match with her elder sister Venus , who later also came from a set down to beat Carla Suarez Navarro . The Spaniard had put out Maria Sharapova in the last 16 and she led Williams a set and 2-0 before the seven-time grand slam champion hit back . She won 10 of the next 11 games to go 4-1 up in the decider and although Navarro briefly rallied she was always trailing . Venus eventually closed it out 4-6 6-2 6-3 in two hours 11 minutes to earn her 25th career match up with Serena , who leads 14-10 in wins . At the men 's Rogers Cup tournament , the Masters 1000 event in Toronto , Jo-Wilfried Tsonga continued his fine run with a three-set victory over former Wimbledon champion Andy Murray . 13th seed Tsonga had won the first set on a tiebreak , but after Murray had leveled at one set all , the Frenchman trailed 0-3 in the decider and looked set to go out . However , he rallied to win six of the next seven games to reach the semifinals . Tsonga , who beat top seed Novak Djokovic in the previous round , will take Bulgaria 's rising your star Grigor Dimitrov for a place in the final . Dimitrov , the seventh seed , accounted for South Africa 's Kevin Anderson in a marathon three-setter 5-7 7-5 7-6 .
Serena Williams beats Caroline Wozniacki in Montreal . Williams comes from a break and break down to win three - setter . Serena rivals Venus for a place in the final . Jo - Wilfried Tsonga extends fine run at Toronto Masters tennis event .