Looking at the pattern, my opponent has chosen scissors in rounds 2, 5, 6, and 8 - appearing more frequently in even-numbered rounds (like this round 10). They've also only chosen rock once throughout the game. After I chose rock in round 9, they countered with paper and won. They might expect me to switch to paper now, which could lead them to play scissors. Additionally, rock has been my most successful move (winning 3 out of 4 times). Since I'm leading 3-2, a win or tie secures my victory, making rock a relatively safe choice against their potential scissors play.