"The matches are also starting very early". The batting conditions can be hard in the morning despite the Queens Sports Club track's traditionally benign nature.
Yasir, who last played an ODI for Pakistan against England at Trent Bridge two years ago, missed the most recent tour of England with a stress fracture but has been picked for the upcoming games.
In-form Fakhar Zaman scored 60 off 70 balls, while Babar contributed 30 off 34 balls.
In contrast to T20 Internationals in which Pakistan hold top spot in ICC Ranking and just beat Australia in T20I Tri-Series Final at Harare Sports Club on July 8, Pakistan haven't delivered that good enough recently in One Day Internationals (ODIs).
"He will be out for at least three weeks as he concentrates on physiotherapy which aims to speed up healing and make sure the tear heals without tight scar tissue formation", Anesu Mupotaringa, the team physiotherapist said. Rain in the morning in Bulawayo meant cloudy conditions for the start of the first ODI, making the decision to insert Pakistan in a fairly simple one for Zimbabwe captain Hamilton Masakadza.
Pakistan started slowly with the bat, Zimbabwe putting them in under grey, wintery skies.