Muguruza isn't giving he opponent many chances to breathe, and that's the reason for her quick success in these recent matches.
In the victory, Muguruza won 72 percent of her first serve points and 46 percent of her second serve points.
No. 28 Maria Sharapova had a good run at this year's French Open, but she fell short in her first quarterfinal match since the 2016 Australian Open after running into defending Wimbledon champion Garbine Muguruza.
But the dogged Romanian scrapped hard to turn the contest on its head to win 6-7 (2-7) 6-3 6-2 to advance to the final four.
Thoroughly and clinically outplayed by Muguruza in every respect, Sharapova looked uncomfortable and off-balance for most of her brief stint on court and had a particularly deflating second set in which she logged two winners to 15 unforced errors. The victor earns a berth in the final at Roland Garros - plus the No 1 ranking that now belongs to Halep.
Muguruza had lost all three previous times she faced Sharapova, whose five Grand Slam titles include two at Roland Garros.
Leroy Sane omitted from Germany World Cup squad
Alongside Sane, Bayer Leverkusen duo Bernd Leno and Jonathan also miss out, as does Freiburg striker Nils Petersen. Speaking on Monday, Low underlined the importance of multi-functional players in a squad for a major tournament.
Muguruza has not dropped a set in this year's tournament and dominated Sharapova with booming groundstrokes and superb returning that earned six breaks.
The top seed roared back in the second set, breaking serve in the opening game and going on to take it 6-3.
"I think it would be unusual for me not to include someone that I have competed against for so many years", said the 31-year-old.
Garbine Muguruza and Simona Halep meet in the semifinals of the 2018 tennis French Open.
Sharapova's eagerly-awaited fourth-round clash with Serena Williams never even made it on court on Monday as her American nemesis pulled out an hour before the scheduled start with a pectoral injury.
When the top-seeded Halep and No 3 Muguruza meet Thursday, their contrasting styles will match up with plenty at stake. Muguruza sensed weakness and pounced for a 4-0 lead.
She has acknowledged having trouble handling her nerves, which is part of why she was so proud about the way she overcame Kerber, a two-time major champion and former No 1. "If I do that, I will be OK after the match, no matter the result".