$60 home tourney. Down to 4 players, top 3 pay. Blinds are 150/300. I'm in the big blind with 5 7 diamonds and have about T900 left in my stack. UTG who is weak tight goes all in for T750. It's folded around to me and in the process 9 spades is exposed. I call, figuring that my cards are likely live (didn't even think about needing the 9) and I'll be pushing it all in the middle soon anyway. Correct move?

Thanks