Tendulkar's century vs Pakistan in Chennai, when we lost by 12 runs. Heartbreaking loss but that was the match that got me into cricket. India vs Pakistan, a great venue, a Tendulkar masterclass but it was the same 'ole case of the 90s - Team India was just Team Tendulkar. Can't believe that is still the case to a certain extent today, with Tendulkar's 175 (You can't expect a man to chase down such a ginormous total all by himself), India vs Sri Lanka in the final of the 05 (iirc) Asia Cup... there are plenty of heartbreaking Tendulkar innings'.
You'd think his greatness would rub off on some of the players eventually. They never gave him support when it mattered most.
Sanga's 192 was awesome as well. There's an especially good Youtube montage - 'Waltz Sangakkara'. That innings was truly a waltz, he was just at ease. One of the most graceful batsman I have ever seen. Sanga is amazing.