Del Potro finished the match with his eighth ace and made only four unforced errors in securing his 18th career title and first in Sydney. He lost only six points on his serve, and Tomic appeared dispirited after being broken to fall behind 4-1 in the second set.
"My forehand worked perfect, I made a lot of winners, many aces, played good slices," del Potro said. "Every long rally we played, I won all of them, which is good for my confidence. I think Bernard was a little frustrated to see me very focused on the match and hitting the ball so well."
Tomic was more succinct.
"I got killed," the 21-year-old Australian said. "There was nothing I could do."
It's about to get more difficult for Tomic. His next match is against top-seeded Rafael Nadal in the first round of the Australian Open. Del Potro will also play his first-round match Tuesday -- against a qualifier.