Celtics Game 7 in 2010
This was incredibly tough on celtics fans at the moment, but it's a killer now as well. Once we got Ray and KG, 2008-2011 should have been "The Celtics Era" of the NBA. We should have been *the* team. At the time, it really felt like it. But this heartbreaking loss (along with our no-show in game 6) left us with just one title while the Lakers got 2. I feel like we were the best team of that era, but in the end, greatness is measured in championships.
Celtics Game 7 in 2012
For me, this one wasn't tough because of how bad it was to lose. It was tough because of how amazing it would have been to win. The celts window was closing, this was going to basically be our last gasp, and we were the clear underdogs but found ourselves in a 1 game winner take all situation. It was a chance to redeem the entire Big 3 era after only winning one title. If we won, it would have been an amazing feeling to put away the (kind of) newly formed and widely hated Miami super team. If we won, it also would have been on the back of Rajon Rondo who would have officially broken out as the new superstar of the team that we could feel confident in building around as the Big 3 era came to a close. Our team fought like heck that game, but alas, everything I mentioned was dashed.