Walton's early career in the National Basketball Association (NBA) was very successful, winning the 1978 NBA Most Valuable Player (MVP) and an NBA championship with the Portland Trail Blazers, for which he was also named Finals MVP. However, his professional career began to be significantly hampered by multiple foot injuries requiring numerous surgeries. Walton sat out the 1978–79 season and was then signed by the San Diego/Los Angeles Clippers, for whom he played four injury-plagued seasons. His career was rehabilitated during two seasons with the Boston Celtics at the end of his career. Playing as a backup center behind Robert Parish, Walton earned the NBA Sixth Man of the Year Award in the 1985–86 season, winning his second championship that same season.