Daniel James Nava (born February 22, 1983) is an American professional baseball left fielder who is currently a free agent. He has played in Major League Baseball (MLB) for the Boston Red Sox, Tampa Bay Rays, Los Angeles Angels, Kansas City Royals, and Philadelphia Phillies. Nava is only the fourth player in MLB history to hit a grand slam in his first major league at bat and the second to do it on the first pitch.
Nava was born in Redwood City, California. He played baseball at St. Francis High School in Mountain View, California and received his Psychology degree from Santa Clara University. He was 4 ft 8 in (1.42 m) and 70 pounds (32 kg) in his freshman year in high school and grew to 5 ft 5 in (1.65 m) and 150 pounds (68 kg) by his senior year.
After an opportunity to walk-on to the Santa Clara University baseball team, he failed to make the team as a player and became the team equipment manager.