Trailing by two in the bottom of the fourth, Vela stepped to the plate with one out and men on second and third. He took the first pitch he saw deep to right field to put Mexico ahead by two.
On the mound for Mexico, Aldair Tellez pitched 5 2-3 innings and struck out 12 Australians.
Mexico will play the winner of Puerto Rico and Venezuela on Tuesday afternoon. Australia was eliminated.
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