Game 3 tournament ruling

Rules Question – Match 3 (Time Limit)

If we just finished game 2 there’s about 1 minute left, and my opponent insists on starting the game, am I required to play out the remaining turns even if the matchup makes it impossible for me to win in time?

Example: opponent on Kai’Sa, me on Teemo — there’s realistically no win condition for me 2 turns if they go first.

In this situation, is it mandatory to play and take the loss, or is it legal to call a tie due to time constraints