Ottniel is a 27-year-old right-arm medium-fast bowler from South Africa. Baartman began his first-class career with South Western Districts on 22 January 2015 in the 2014–15 Sunfoil 3-Day Cup. In September 2018, Northern Cape named Baartman in their team for the 2019–20 CSA Provincial T20 Cup. In January 2021, Cricket South Africa included Ottniel in the Test squad for the upcoming series versus Pakistan. However, Baartman was unable to tour with the squad because of a medical problem.