Are these two sentences grammatically correct?

They sound good to me.

You might also hear (in the U.K.)

'Spurs are the only team from which I don't like any player.'

Are is often used after sports teams in the U.K. as they are often treated as plural nouns.

E.g.

Manchester United are the most famous team on the planet.

Chelsea are top of the league.

Barc

Anonymous'Spurs is the only team from which I don't like any player.'

That is not a natural sentence. This is better (American English)

The Spurs is the only team that has no players that I like.

Anonymous'I don't understand a single word that has been taught in Physics so far.'

I would change the order a little:

I agree with AlpheccaStars. The first sentence would sound unnatural in conversation.

Spurs is the only team, from which I don't like any player.'

Correct.

Spurs is the single team so the use of singular verb "is " is right there.

'I don't understand a single word that has been taught in Physics so far.'

Correct.