Turkey shot 3-for-22 from beyond the arc against Germany, losing a lopsided game for the second straight night and enters its game against the Czech Republic knowing the loser will be eliminated.
At the San Pablo Municipal Stadium, Latvia and Spain exchanged the lead before Gasol put Spain up for good 29-27 with an emphatic dunk.
Jose Calderon's last-second three put Spain ahead 41-36 at halftime, and it opened the third quarter with a 15-6 run to cement its lead.
Damir Markota scored 13 and four other players reached double figures, leading Croatia over Portugal and boosting its chances for the second round.
Also in Group D, Radoslav Nesterovic of the Raptors had 11 points and 12 rebounds, while Erazem Lorbek added 16 points and Jaka Lakovic had 15 points to put Slovenia past Italy and into the second round.
An Italy loss against Poland would be the Azzurri's worst finish at the Europeans in its history.
The top-three from each four-team group advance into the second round of group play, which will decide the quarter-finals, which begin in Madrid next Thursday.
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