Murray required two medical stoppages for cramp and received treatment to his thigh as he battled with his fitness and form
World number one Carlos Alcaraz sailed into the Paris Masters third round with a 6-4, 6-4 win over Yoshihito Nishioka but Rafael Nadal and Daniil Medvedev both slumped to surprise losses on Wednesday.
'At the moment, we're still working on ways to make cricket more Covid-secure but we can't change the guidance yet.'
The world's greatest athletes descend on London in July for the 2012 Olympics. Martyn Herman highlights 10 to watch when the Games get underway.
The 48-year-old, who has taken 373 Test and 416 ODI wickets in his career, said fast bowlers need to focus on four-day cricket to succeed in Tests and the upcoming domestic season will be important for the development of pacers in his country.
368 of James Anderson's 575 Test wickets have come on home soil, where the Dukes ball has been the default during his long career.