Pakistan bowler Usama Mir has created history as the first-ever concussion substitute in the World Cup.
Usama Mir came on as a concussion substitute for Shadab Khan in the second innings of the match between Pakistan and South Africa. Shadab Khan went off the field in the 3rd ball of the South African inning and thus the Pakistani bowler Usama Mir was brought in as his substitute.

Shabad Khan was hit on the head while fielding early in the South Africa inning and left off the field. In cricket, a concussion substitute can take part in bowling and batting if required.
Shadab Khan got injured early in the South Africa chase. He was fielding at mid-on and on the second legal delivery of the inning, he fell awkwardly while throwing a ball and hit his head. He was lying down at the field for minutes but walked off the field after medical attention. He was back in the field after a while but was taken off eventually during the 15th over.
"Teams will have the option of replacing a player who has sustained a head or neck injury during an international match and has subsequently been diagnosed with concussion or suspected concussion," the ICC rule says on a concussion substitute, which was implemented from August 1, 2019.
Usama Mir thus becomes the first player to be brought on as a concussion substitute in World Cups, and the Pakistan player has also taken part in bowling. He has so far bowled two overs and has also picked up the wicket of Rassie van der Dussen.
Earlier, Pakistan scored 270 runs before getting bundled out by the Proteas bowlers. Babar Azam and Saud Shakeel scored half-centuries while Shadab Khan contributed with bat as well, scoring a breezy 43 off just 36 balls. South Africa's Tabraiz Shamsi picked up four wickets with the ball.