The seventh-seeded Italian scripted a stunning comeback win against Hurkacz to register a 3-6, 7-6(6), 6-1 triumph at the clay-court ATP Masters 1000 event.
This win saw Korda rise to number 28 in ATP Live Rankings and could see a new career high after the tournament but Medvedev, a former world number one has dropped out of the top 10 to sink to number 12 in the live rankings.
Fritz was followed by Madison Keys, who defeated Magda Linette 6-4, 6-2. Fritz and Pegula then completed a 5-0 sweep by defeating Lukasz Kubot and Alicja Rosolska in mixed doubles, 6-7(5), 6-4, 10-6. The US team is now 4-0 in mixed doubles in the United Cup.
The tie hung by the thread but the Polish pair prevailed over their Italian counterparts in straight sets to claim the victory. They won by 6-1, 6-2 in the crucial match.
After claiming the first break of the match for 4-3, however, the top seed's variety of consistent, strong hitting came to the fore as he clinched a 98-minute victory.
On the other hand, Hubert Hurkacz ended Nick Kyrgios' winning streak at the tournament as he clinched the match to enter the semi-final on Friday in Montreal.