Riot reportedly requires MSI players to wear masks during games.

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[{"selector":"#anim-159f9cbd-473f-4e8d-b78b-941806cd067f [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-5fc16963-b548-4161-a7aa-f5eca3080370","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-7fc14764-274e-486c-ac8d-ffd8d0e90968","keyframes":{"transform":["translate3d(0px, 141.36846%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] Riot Games requires that pro gamers wear masks during League of Legends matches at the Mid-Season Invitational, providing a less than 24-hour notice before the start of the tournament. Riot Games requires that pro gamers wear masks during League of Legends matches at the Mid-Season Invitational, providing a less than 24-hour notice before the start of the tournament.