Gibson broke for 2-0 and again for 4-0 and again for 6-0, clinical in dismantling Kasatkina without conceding a game.
Gibson broke for 2-0 after a 6 minute deuce game, but Kasatkina broke for 1-2 in a gruelling 13 minute deuce game, then Gibson held for 6-5 and broke for 7-5 to take the set.