Answer
Bayern Munich's Bundesliga debut for Claudio Pizarro happened against Bayer Leverkusen. Pizarro, a Peruvian striker, joined Bayern in 2001 and made his first appearance for the club on August 11, 2001, in a match against Leverkusen at the Ulrich Haberland Stadium. Though the match resulted in a 3-1 defeat for Bayern, Pizarro managed to score a goal, leaving his mark on his Bundesliga debut.