Looking at the pattern so far, I won the first two rounds with paper and then scissors. My opponent chose rock, then paper, showing a potential sequential pattern. If this pattern continues, my opponent may choose scissors next. To counter scissors, my best move would be rock. Additionally, since I've already played paper and scissors in previous rounds, my opponent might expect me to complete the cycle with rock, but could also try to anticipate this and counter with paper. However, given the established pattern and psychological tendency for players to avoid repeating recent losses, rock seems like the most strategic choice for this round.