Answer:
It should be: My Rugby coach at Western
Step-by-step explanation:
Firstly, since the first letter in a sentence is always capitalized, the word "my" needs to have a capital M to be transformed into "My". Next, since Rugby is a sport and is counted as a noun, it should be capitalized as well. Moving on, the word "coach" is not specific with a name so it should stay un-capitalized. Lastly, the word "western" could be tricky but since the sentence includes "at", it means that "western" is a place. Since, it's a place, it's a noun which means that it would be "Western" and not "western".
I hope you found this explanation helpful:) Happy to help!
-Unicorn233