The Eastbourne-based player sprung a major surprise by splitting with Spanish coach Carril a month later and then bought in one of the women's tour's most experienced coaches in Wim Fissette at the start of the year.
The Croat, considered as a future Slam victor, couldn't find a way to stop Venus, the only former Wimbledon champion left.
Murray, who came through his seemingly mandatory annual Wimbledon scare at dusk against Fabio Fognini on Friday night, faces another unpredictable opponent in Benoit Paire second on Centre Court on Monday.
Venus, the eight oldest woman to win back to back matches at the All England Club, made the difference winning 18 out 27 rallies under four shots, looking fairly unstoppable from the beginning.
With Halep in roaring form, she will be keen to go all the way and win her first grand slam.
He joined Roger Federer, who reached his 50th Grand Slam quarter-final and 15th at Wimbledon with a 6-4, 6-2, 6-4 win over Grigor Dimitrov.
She kept the light burning.
Spectators sitting on "Murray Mound" shelter under umbrellas as they watch the Women's Quarterfinal Singles Match betweenRomania's Simona Halep and Britain's Johanna Konta on the big screen on day eight at the Wimbledon Tennis Championships in London Tuesday, July 11, 2017. Current world number one Angelique Kerber of Germany was beaten by Spaniard Garbine Muguruza in the last 16.
What time is Johanna Konta on TV at Wimbledon?
Halep controlled the game reducing the errors while signs of rust surfaced in Azarenka's game.
"Who knows if she's lost a step?" said Williams' coach, David Witt.
Konta eventually won the third set of that match 10-8 and this was heading the same way before she broke Garcia at 5-4 to complete her win. She's a huge ball striker who likes to dictate the points.
If Konta notched up a record, becoming the first British woman to reach a Wimbledon singles semifinal since Virginia Wade in 1978, Halep missed an achievement - winning the match would have made her World No. 1.
Halep looked at the umpire, seemingly hoping to have the point replayed.
Konta remained firm when she was told what Halep had said when she faced the press an hour after the Romanian. I'm not playing against a past experience.
Garcia herself admitted that she "did not know" where the difference between the two was afterwards.
"I was just very happy with how I was able to compete and not pay too much attention to necessarily the good things she was doing and try to keep in mind all the good things I was doing". She's a fighter. I'm sure she was using the crowd.
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Then the comparisons with Leonard Fournette started. "It's a little disrespectful", senior defensive lineman Kendal Vickers said. Coaches tend to be more reserved in these settings, while at times players begin to allow their personalities to shine through.
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