[4] However, their initial foray into the competitive scene faced an early setback when they were eliminated during the group stage of the Season 3 North American Offline Qualifier for the League of Legends Championship Series (LCS).

[6] The team's emerged victorious at the 2013 MLG Summer Promotion Qualifiers, defeating Velocity esports in the finals.

[11][13] In their first match, on September 23, Cloud9 lost to the top-seeded European team Fnatic by a score of 1 games to 2, eliminating them from the tournament.

However, on April 30, Hai suffered a collapsed lung, which would prevent him from attending the All-Star event; two days later, Counter Logic Gaming's Link replaced him in the lineup on a loan.

[38] The team made an early exit in the tournament after falling to GE Tigers and Flash Wolves in their first two matches of the group stages.

By the end of the regular season, the team finished with a 12–6 record, and after defeating Counter Logic Gaming in a tiebreaker match, they claimed the second seed and a first-round bye in the playoffs.

[42][43] Hai's retirement ended the team's nearly 750-day record of having the longest starting lineup in professional League of Legends history.

[44] While Hai stepped down as a competitor, he remained with Cloud9 in an organizational role as a partner management and team expansion assistant.

[46] Cloud9 dropped the three of the next four games, heading into the final two weeks with a 4–10 record and in eighth place – a low enough placement to be relegated.

[52] Cloud9 started the group stages going 3–0 in the first week, defeating ahq eSports Club, Invictus Gaming, and Fnatic.

[61] Jensen (formerly Incarnati0n) was named to the NA LCS Spring Split 1st All-Pro Team and was a runner-up for the league's Most Valuable Player award.

[71] At the Regional Qualifiers, they swept Team EnVyUs, 3–0, in the second round and defeated Immortals, 3–1, in the finals, giving them the third seed for North America in the 2016 World Championship.

[76] On December 19, Cloud9 officially announced they had promoted Contractz from their Challenger team to replace Meteos and signed former Dignitas player Ray as a substitute.

[79][80] The team finished the regular season in second place with a 14–4 record and a first-round bye in the Spring Split Playoffs.

The team defeated Counter Logic Gaming 3–1, to advance to the play-ins and represent North America as the third seed.

[107] Before the Summer Split began, Jensen, Sneaky, and Smoothie were benched from the starting lineup, with Goldenglue, Keith, and Zeyzal being promoted from Cloud9's academy team as their replacements.

The win marked the first time in seven years that a North American team had qualified for the World Championship semifinals.

[121] In the 2019 LCS Spring Split, Cloud9 secured the second seed and a bye to the semifinals of the playoffs after a win over FlyQuest on March 23.

[129][130] Svenskeren won the Summer Split Most Valuable Player award and was named to the LCS All-Pro 1st Team.

[134] After their LCS finish, Cloud9 qualified directly into the group stage for the 2019 World Championship as North America's second seed.

[139] Cloud9 began the 2020 LCS Spring Split with a 12–0 record through the first six weeks, securing a spot in the winners bracket of the playoffs in the process.

[151] After splitting their final two games, they finished the regular season in second place with a 13–5 record and a bye into the second round of the playoffs.

[171] For the first round of the tournament, Cloud9 was placed into Group C with Korea's DWG KIA, Japan's DetonatioN FocusMe and Latin America's Infinity Esports.

[175] After beginning the Spring Split of the 2021 LCS season with a 4–5 record, Cloud9 brought Zven back to the starting roster, and K1ng returned to the Academy team.

[178] In the first match of the double-elimination 2021 LCS playoffs, Cloud9 faced Team Liquid, and lost by a score of 1–3, sending them to the lower bracket.

[182] At Worlds, Cloud9 started in the Play–In stage, and were drawn into Group A, alongside Taiwan's Beyond Gaming, Japan's Detonation FocusMe, Turkey's Galatasaray Esports, and the Unicorns of Love of the LCL.

[196][197] After their defeat in the 2021 World Championship quarterfinals, Perkz and Vulcan left the team, and Cloud9 signed Summit, Beserker, and Winsome as players and Nick "LS" Desare as their new head coach.

[198][199] After a strong 3–1 start to the split, falling only to heavy favorite Team Liquid, it was announced less than an hour before Cloud9's first match of week three that LS had been dismissed as head coach.

Earlier that year, Team SoloMid had won the 2013 Spring Split, making them the defending champions of the LCS.

[209] The following year Cloud9 returned the favor, defeating Team SoloMid in the 2021 Summer Playoffs, eliminating them from post-season contention and in doing so, Cloud9 claimed the finals spot at Worlds 2021.