TSM and Counter Logic Gaming were the only teams to go 3-0 last week in the 2021 League of Legends Championship Summer Split, and both of those teams share something else in common, too. TSM and CLG are the only teams in the LCS to have not made a single change to their respective rosters before or during the LCS Summer Split. 

Outside of TSM and CLG, the other eight LCS teams have made adjustments to their rosters in the past few months, but the context of the moves varies by team. For example, Immortals mid laner David "Insanity" Challe was not benched, but instead, IMT Academy mid laner Prodromos "Pretty" Kevezitidis was allowed to make his LCS debut in Insanity's place against Evil Geniuses due to his strong performance in the 2021 LCS Academy League. Pretty only started a single game for IMT.

FlyQuest's roster swap was similar in impact. In the final week of the 2021 LCS Spring Split, FLY Academy support Han "Dreams" Min-kook was promoted to the LCS in favor of David "Diamond"  Bérubé, and Dreams has retained that starting position this summer. Golden Guardians also made promotions from GG Academy in the form of support Jonathan "Chime" Pomponio and newly signed top laner Colin "Solo" Earnest ahead of the start of the Summer Split. 

Evil Geniuses made a surprising move ahead of the LCS Summer Split, promoting Evil Geniuses Prodigies AD carry Kyle "Danny" Sakamaki all the way to his debut in the  LCS in favor of Matthew "Deftly" Chen, who was released after the Spring Split. 

100 Thieves solved its mid lane uncertainties by signing star mid laner of FC Schalke 04 Esports Felix "Abbedagge" Braun a few weeks prior to the start of the LCS Summer Split. A few days before the start of the split once Cloud9 had returned from the 2021 Mid-Season Invitational, it was announced that star AD carry Jesper "Zven" Svenningsen would be benched in favor of C9 Academy's Calvin "k1ng" Truong, who made his LCS debut in the first 3 weeks of the split before Zven returned. 

Two teams made roster changes after the 2021 LCS Summer Split was already underway. After losing its opening day match, Team Liquid announced that star top laner Barney "Alphari" Morris would be benched in favor of TL Academy's Thomas "Jenkins" Tran. Following week 2, Dignitas swapped mid laner Max "Soligo" Soong with DIG Academy's David "Yusui" Bloomquist.

After DIG's first match of week 3 ended in a loss against Golden Guardians, jungler Joshua "Dardoch" Hartnett was benched in favor of DIG Academy's Matthew "Akaadian" Higginbotham, though the team failed to win its remaining two matches against TSM and Counter Logic Gaming last weekend. 

Throughout the first nine games of the 2021 LCS Summer Split, TSM and CLG are respectively 7-2 and 4-5. These records are good enough to earn TSM 1st place LCS honors due to its cumulative 2021 season record of 19-8, while CLG has currently sits tied for 8th place with FlyQuest at a cumulative record of 9-18.