The world No 1 was in control from the outset against a nervous-looking Australia's Ashleigh Barty, whose challenge was undone by a string of unforced errors.
The top seed, who claimed the Montreal title in 2016, won seven of the last eight games as she wrapped up a straightforward victory over the 22-year-old Australian in one hour and 11 minutes.
Spaniard Carolina Garcia, the No.6 seed, was combative in the first set before Halep secured a crucial break to win the opener 7-5.
Halep complained Friday about playing the first semifinal day after two straight night matches.
Ashleigh Barty of Australia drapes herself over the net after missing a return to Simona Halep
The Frenchwoman might have thought she was at a practice session with her team as she took on Maria Sharapova at the Rogers Cup third round, playing a feisty game with smooth, basic strategies to win over the Russian 6-3, 6-2.
She then raced through the second set 6-1 with minimum fuss.
"I think the match was a very good level of tennis even if the rhythm was a little bit mixed". "Simona Halep raises her game at just the right time", a commentator said anxiously. "Yeah, it's disappointing, but I think this will help me moving forward, getting ready to go into (Cincinnati) and the U.S. Open".
The world No.16 broke Berten's serve fours times and never faced a break point to book her first-ever semi-finals appearance in Canada. Sharapova had a lot of spunk and great rallies for her French opponent and she combined some good tactics, to lead in the first set 2-all but the Frenchwoman played a patient game and soon leveled the score to 3-all.
Barty, the world No. 16, has eclipsed her previous best at the tournament, a place in the last 16 when it was held in Toronto a year ago.
Ivanka Trump: No room in U.S. for 'white supremacy, neo-nazism'
Washington police chief Peter Newsham said firearms will be prohibited at the rallies, even for gun owners with legal licenses. But, he added, "The state police is fully prepared to act on any inciteful violence". "Peace to ALL Americans!" he tweeted .
Newcastle United suffer unlucky defeat to Tottenham on opening day
A gutsy second half display saw Kenedy waste a one on one and the Spurs woodwork struck twice, so maybe a deserved point went astray.
Turkish Currency Lira Plunges As Trump Piles On The Pressure
In a second speech, this time in the Black Sea city of Rize, Erdogan ruled out any change in the country's interest rates policy. But Mr Erdogan indicated he was in no mood to offer concessions to the United States, or financial markets. "I am asking you".