An out of sorts Svitolina lost the decider in 23 minutes and Halep set up a clash with second-seed Karolina Pliskova, a 7-6 (7-3) 6-4 victor over France's Caroline Garcia. If Halep can get past Pliskova and then go on to win the title, she'll be the new No. 1.
After crashing out of the Australian Open in round one, Halep's form steadily improved and she won on clay in Madrid before finishing runner-up to Elina Svitolina in Rome.
"Actually I'm very bad with the memories", Nishikori said.
But she got through it - aided by a net-cord victor on her first set point in the tiebreak - and cruised in the third for a 3-6 7-6 (8-6) 6-0 win against the Ukrainian who handed Halep her lone defeat in the month of May in the Italian Open final.
After Venus Williams and Svetlana Kuznetsova lost Sunday, the French Open - which is missing Serena Williams, Maria Sharapova and Victoria Azarenka - is guaranteed of producing a first-time grand slam victor.
Dabrowski and Bopanna, the seventh seeds, won their semifinal 7-5, 6-3 Wednesday against No. 3 seeds Andrea Hlavackova and Edouard Roger-Vasselin.
After three relatively straightforward wins over Jana Cepelova, Tatjana Maria and Darya Kasatkina - none of whom are push-overs - she took on the seeded Carla Suarez Navarro and put on a clinic, taking the victory 6-1, 6-1.
"I pushed her back, I tried to be aggressive and I was extra motivated because I really enjoy this court and it's great to play the quarter-final again". He was a runner-up at Wimbledon in 2010 and reached his highest ranking of No 4 previous year.
That semi-final has particular significance because the Czech will climb to world No. 1 for the first time with a victory, while the Romanian can claim the top spot if she wins the tournament.
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"I am sure everyone will join me. we share our thoughts and prayers with everyone who has been affected". In the eighth game to Svitolina came to serve for the semifinals, but ran into several successful attacks from Halep and lost her serve.
Pliskova reached the U.S. Open final a year ago but had never been past the second round in five previous appearances in Paris.
Fifth seed Svitolina twice served for the match at 5-2 and 5-4 in the second set and then had match point at 6/5 in the tie-break.
The Czech edged a marathon 77-minute first set against 28th seed Garcia in a tie-break, having failed to convert an earlier set point at 5-3.
"It's fantastic how hard it is to go deep in a grand slam because you have to play the best guys round after round and it's not getting easier on Friday".
"I am very happy".
Wawrinka, meanwhile, is 11-2 against quarterfinal opponent No. 7 Marin Cilic, who was leading 6-3, 3-0 when Kevin Anderson stopped because of an injured left hamstring.
Branstine, 16, from Irvine, Calif., is playing her first Grand Slam tournament as a representative of Canada after making the decision in March.
Dealing quite well with a swirling wind that other players complained about, Murray made only 14 unforced errors and broke the strong-serving Khachanov five times. I don't think it's better [now], but somehow I'm just winning.
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