Pliskova fights back to set up clash with Barty in Stuttgart
"It was a really good match, because there was not many easy mistakes from both sides.
"It was a far better performance from me," she added, having laboured in Wednesday's victory over lucky loser Tamara Korpatsch.
"It always helps me when I break a racquet," the Czech said.
"She's on a good run and has won a few tournaments, but I have nothing to lose," added Pliskova.
Barty, who won a pre-Australian Open tournament in Melbourne and the Miami Open earlier this month, breezed into the quarter-finals Wednesday by overpowering Laura Siegemund following a first-round bye.
She is using the Stuttgart event as part of her preparations for next month's French Open, where she won her first Grand Slam title in 2019.
She sat out the 2020 tournament at Roland Garros because of the Covid-19 pandemic.
Fifth seed Aryna Sabalenka of Belarus faces Anett Kontaveit in the quarter-finals after her 6-4, 6-2 win over German qualifier Anna-Lena Friedsam.
Estonia's Kontaveit is looking to knock out another big name after shocking Sofia Kenin of the US, ranked fourth in the world, in the second round on Wednesday.