SIR - Serena Williams has been a great advocate for women's tennis and when she was beating players regularly she also had a kind word for her opponents. Now that her powers are on the wane she is becoming a bad loser.

I am sick and tired of the lack of respect that some of our overpaid stars have towards referees and umpires, they are damaging their respective sports.

Serena Williams is supposed to be a fan of the late soul singer Aretha Franklin, so it's time she and her ilk showed a little 'respect'.

John Appleyard, Firthcliffe Parade, Liversedge