World number one Serena Williams and sister Venus will renew one of sport's great sibling rivalries after posting quarter final wins at the Rogers Cup on Friday to set up a showdown on the Montreal hard courts.
Serena kept her title defence on track, rallying for a 4-6, 7-5, 7-5 win over Caroline Wozniacki while Venus booked her place in the last-four four by beating 14th-seed Spaniard Carla Suarez Navarro 4-6, 6-2, 6-3.
It will mark the 25th time the sisters have squared off and first since a 2013 semi-final clash in Charleston that Serena won.
While it is a matchup tennis fans always look forward to, for the sisters it is something they could live without.
"I definitely don't like playing her," explained Serena. "I think I've lost to her more than anyone on the tour. Definitely not a fun match. She's tough. She has a great serve. She runs every ball down. She has a great backhand. She hits winners off the forehand.
"She does everything well, so it's not an ideal matchup for anyone, to be honest."
Despite the high praise, Serena holds a 14-10 advantage over her older sister in head-to-head meetings and has come out on top in their last five encounters, including the 2009 Wimbledon final.
Saturday's meeting will be just the second in the last five years and Venus has a simple philosophy of how to play her sister.
The other semi will pit third seed Agnieszka Radwanska against Ekaterina Makarova.
Poland's Radwanska, the third seed, advanced with a dominant 6-2, 6-2 win over Belarus' Victoria Azarenka. Unseeded Russian Makarova beat American qualifier Coco Vandeweghe 6-1, 4-6, 6-1.