Atiwit “Jazz” Janewattananond (Thai: อติวิชญ์ “แจ๊ส” เจนวัฒนานนท์, born 26 November 1995) is a Thai professional golfer who plays on both the Asian and European Tours.
Janewattananond turned professional in December 2010. In September 2011 he played in his first Japan Golf Tour event, the 2011 Asia-Pacific Panasonic Open, where he made the cut and finished tied for 65th.
Janewattananond achieved his first career win on the Asian Tour in February 2017 at the Bashundhara Bangladesh Open. He won again during the 2018 season at the Queen’s Cup in his home county, Thailand. He also qualified for the 2018 Open Championship, but failed to make the cut.
In January 2019, Janewattananond won the SMBC Singapore Open by two shots, a tournament co-sanctioned by the Japan Tour and the Asian Tour. This win brought him into the world top 100 and secured him a place in the 2019 Open Championship. His position in the world top 100 also gave him a place in the 2019 PGA Championship where he finished tied for 14th place. He had been tied for second place after three rounds but a final round 77 dropped him down the field. He won three more Asian Tour events in 2019, winning the Kolon Korea Open in June, the BNI Indonesian Masters and the Thailand Masters in December. His Indonesian Masters win lifted him into the world top-50 for the first time and earned him a place in the 2020 Masters Tournament.
Janewattananond was born in Bangkok, Thailand. His nickname comes from his father, an avid fan of jazz music. At the age of 14 years and 71 days he became the youngest golfer to make the cut on the Asian Tour, which he achieved at the 2010 Asian Tour International in Nakhon Pathom.
Janewattananond took a brief sabbatical from golf at the end of the 2016 European Tour season to join the monkhood, to which he credited the subsequent upturn in his performances on the golf course.