The only other teenager in National Basketball Association history to record a triple-double was Philadelphia 76ers guard Markelle Fultz last April.
The All-Star forward finished with 33 points and 10 rebounds against the Dallas Mavericks.
When the Raptors pulled to 101-99, Doncic answered with a long 3 to reach 30 points for the sixth time this season.
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The 35 points were a career high for Doncic, who turns 20 on February 28.
In addition to setting new career highs in points and rebounds, the 19-year-old Doncic set a handful of milestones with his second career triple-double.
Doncic is the only player in league history to record multiple triple-doubles as a teenager, with both coming in the past four games. Doncic got his 10th assist to complete the triple-double by feeding DeAndre Jordan for an alley-oop dunk with 3:29 left in the fourth.
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Pascal Siakam's three-point play snapped a 108-all tie with 3:56 remaining as the Raptors recovered from a poor third quarter and a 92-85 deficit early in the fourth.
Leonard credited the team's switch to a zone defense in the fourth quarter to help slow the Mavs down. The Mavericks' free-throw shooting (23 of 34 for 67.6 percent) also burned them down the stretch.
Dallas Mavericks undoubtedly have been very great in their game scoring three major wins from the eight games they scored. Toronto missed its first 10 shots of the quarter and then lost the lead for the first time since the opening minutes of the game when Dennis Smith Jr. made a layup and a 3-pointer to put Dallas up 75-74.
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I would contend that this entirely tone deaf "well actually" on behalf of the league only makes it look worse. That prize is equal to her salary from playing hockey in 2018.
The loss to the Raptors dropped the Mavericks to 22-27 this season.