Find the appropriate form of verb to fill in the blank:
Paul and I played tennis yesterday. He’s much better than me, so he [fill-regular] (win) easily.

• The sentence is talking about something that went on it's past.
  As per the question we'll use the easy past which may be a verb tense wont to show that an action befell at a selected time within the past.
  Remember that the easy tense of the verb is usually wont to discuss past habits and generalizations.
• Now, allow us to examine the examples and find an appropriate solution for the given question –
• Option A: is wins, this can be within the tense. Hence, can't be used.
• Option B: won, is within the simple past. Hence, we are able to use it.
• Option C:  has won is within the pluperfect tense. Hence, can not be used.
• Option D:  will win is within the tense. Hence, we cannot use it.

He⁠⁠⁠⁠⁠⁠nce, option B is the correct answer.