Williams then broke Pliskova in the fifth game for a 3-2 lead.
Speaking after a hard-fought victory against Australian Ashleigh Barty, Serena said, "I'm probably not where I was before I left".
"I feel like a super hero when I wear it".
Her next opponent may well be a familiar face, with Williams hoping to come through a testing third-round match with Germany's Julia Goerges later on Saturday. She won match point after Pliskova hit the top of the net on a return.
"The biggest difference is definitely I'm semi on time today", she said.
"In the first set she gave me a hell of a lot of cheapies, a lot of errors", said theAustralian who had secured her highest ever seeding at a major in Paris.
Williams played a bad game to hand over a break in the first game of the second set and she looked in big trouble at a set and a break down.
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In the regular season, Love averaged 17.6 points and 9.3 rebounds a game. I tried to bring it out and get enough space to maybe get a shot off.
But from somewhere Williams got her serve firing and summoned up her powerful groundstrokes to blow Barty away 3-6 6-3 6-4.
After a 90-minute rain interruption at 5-5 in the first set Muguruza, the 2016 victor, blew 2009 champion Kuznetsova away in the tie-break and went on to win 7-6 (7/0) 6-2.
Barty had spoken of seeing facing Williams as an opportunity, and it was one the Australian looked like grasping.
"I mean, I played well". You know, despite the record that I have against her, I always look forward to coming out on the court and competing against the best player.
The 36-year-old showed no nerves to clinch it 6-4 and demonstrate that while she may not be at her very best she will still be tough to beat in Paris.
The 23-time Grand Slam victor used her serve, which is her biggest weapon to great effect in the decider, breaking the third game.
This match could be exactly what Serena Williams needed. She has already gotten the ball rolling, having beaten Croatian player Donna Vekic 7-5 6-4 in yesterday's tense match. "I don't want to limit myself". "It was something I was born with, thank goodness", Serena said.