American player Sam Querrey leaving Russia for London after contracting coronavirus "did not sound great from the outside", says Britain's Dan Evans.
Querrey was given a suspended £20,000 fine by the men's governing body, the ATP, for breaching Covid-19 protocols.
The former world number 11 said he did not "feel comfortable" staying in Russia with his wife and baby son.
"Sam's situation was his situation. I heard there were lots of other things involved," said Evans.
Querrey, 33, and his family left Russia in a private jet after all three tested positive for the virus before the start of the St Petersburg in October.