The 484th-ranked Montgomery swept to a 6-4, 6-2 win against her 109th-ranked opponent, who finished her quarterfinal match against Caty McNally on Saturday morning, in the Wimbledon warm-up tournament in one hour and eight minutes.
After a tight first set, where she broke serve in the seventh game, Montgomery, ranked 95th in the WTA before injury last summer, fired down 11 aces and broke her Australian opponent's serve twice in the second set to cruise to her first-ever final on the tour.
The 21-year-old meets world number 45 Krejcikova, who got past Poland's Magda Linette 6-3, 7-7 (7/4) in her semi-final.
Krejcikova rallied from 5-3 down in the second set and broke Linette's serve to seal victory after just over two hours.
The 30-year-old, who won the French Open in 2021 and Wimbledon in 2024, will attempt to win her first title of the season on Sunday in a first-time matchup against the American, who is targeting her first career WTA title.
Check the full match statistics on Flashscore
