Winitana attended Hastings Boys' High School and played for the school's A1 team in 1994 where he scored a New Zealand secondary school record for points scored in a single game against Central Hawke's Bay where he scored 96 points. In 1995, he attended the Church College of New Zealand and helped his team defeat Palmerston North Boys High in the National secondary school boys final. He was selected to the all-tournament team, and was chosen to play as one of the top ten high school players in the country against the country's top ten second division players; his team lost the match but he was awarded the game MVP.
Professional career
In 1996, Winitana played his first year of professional basketball for the North Harbour Vikings and won the NZNBL Rookie of the Year award. After demonstrating his world-class potential in the NZNBL, Winitana was offered several opportunities to play basketball in the United States, including a full scholarship to the University of Wisconsin. But he turned them down to go on a two-year mission for the Church of Jesus Christ of Latter-Day Saints. The mission also meant that he missed out on the chance to represent New Zealand at the 2000 Sydney Olympic Games. In 2001, Winitana returned to the NZNBL and played for the North Harbour Kings and the Hawke's Bay Hawks. In 2002, Winitana was selected to the Tall Blacks squad, making his international basketball debut for New Zealand. He played for the Tall Blacks in the 2002 FIBA World Championships where they came fourth – New Zealand's highest ever placing. He also played for the Harbour Kings in 2002 and averaged 16.7 points in 15 games. In 2003, Winitana returned to his hometown Hawke's Bay Hawks and after averaging 20 points per game in 17 games, he was signed by the New Zealand Breakers for the club's inaugural season in the Australian NBL. He continued to play for the Hawke's Bay Hawks in the coming years and led his team to the 2006 NZNBL championship in 2006 while garnering the league MVP award. In 2007, Winitana re-joined the New Zealand Breakers for the 2007–08 NBL season. The following season, he played for the Adelaide 36ers. In 74 ANBL games over three seasons, Winitana averaged 3.6 points and 1.5 rebounds per game. In 2009, Winitana moved to the Christchurch Cougars and played two seasons for them before returning to the Hawks in 2011. After the Hawks started the 2015 season with a 4-8 win/loss record, the club released coach Liam Flynn from his head coaching duties and replaced him with Winitana, already the team's co-captain alongside Jarrod Kenny. He returned to the Hawks for the 2016 season, but relinquished the captaincy role. Coming into the 2017 season, Winitana was not retained by the Hawks. He ended his career with 304 NBL games, which is ranked eighth all-time. He had his jersey retired by the Hawks on 13 May 2017.
