The Argentine Apertura championship ended in a three-way tie on Sunday as leading trio San Lorenzo, Boca Juniors and Tigre all won their final games to finish level on points at the top and force a playoff. Goal difference is not used to decide the title and a three-way playoff will be held, the first in the tournament's history, with matches on Dec. 17, 20 and 23. All three teams won by single-goal margins on a tense afternoon to finish with 39 points from 19 games. San Lorenzo won 1-0 at Argentinos Juniors, Tigre beat Banfield by the same score and Boca beat Colon 3-2 after racing into a three-goal lead in less than half an hour. Defending champions River Plate finished bottom of the table after drawing their final game 1-1 with Estudiantes on Saturday. River won only two games and managed a paltry 14 points in their campaign.