Step-by-step explanation:
Incorrect sentence: When Anton plays football, he tackled harder than anyone else on
the team
This sentence's use of verb tense is incorrect because the first verb is in present tense but the second one in past tense.
A time-related activity can be added to a main clause with a connective preposition¹ such as before, after, when, or while. When the verb in the main clause is present tense, the verb in the clause following the preposition reflects the same time frame—present tense.
so here, it should have had been tackles instead of tackled.