In the final round, considering the current score and previous rounds, I notice that the opponent has chosen paper three times, resulting in two ties and one loss. Given that I'm already ahead, a safe choice would be to choose scissors, which would beat paper if the opponent chooses it again. However, considering the opponent's overall strategy and the need to secure a win, choosing rock is a more aggressive approach, as it has beaten scissors in the past and could potentially catch the opponent off guard if they were to choose scissors again. Therefore, I will choose rock to try and win the round and secure the game.