Second Selection: Rivalry Battle (セカンドセレクション「ライバルバトル)- is the second selection of the Blue Lock Project.
125 strikers from each of the 5 stratum are left from the First Selection. The Second Selection is divided into 4 stages. It's a leveling system in which strikers are only allowed to move on after they clear each stage. Those who clear this selection will participate in a strengthening training camp with players from all around the world.
The first stage is an individual match between a striker and BLUE LOCK MAN, a holographic goalkeeper. Strikers must score 100 goals within 90 minutes to pass within a limited area. After 30 goals, the difficulty increases as more holograms that are stationary are added. After 60 goals, the additional holograms begin moving quickly and the balls that are sent are faster and spinning.
The second stage is a match between teams of 2 and the elimination stage of the Second Selection. If you don't get chosen from the second stage then you are eliminated from Blue Lock
The third stage is a match between teams of 3. The team that scores 5 goals first wins. The winning team takes one member from the losing team and continue on to the fourth stage. The losing team will have to return to the second stage.
The fourth stage or clear stage is a match between teams of 4. The team that scores 5 goals first wins. The winning team takes one member from the losing team and continue on to the Third Selection. The losing team will have to return to the third stage.
Those who are eliminated in the second stage are able to participate in a secret loser's qualifier, known as [[Wild Card]] that acts as a secondary way of advancement. It is a much more intense and unforgiving path of advancement as only one player is allowed to gain victory and further advancement through this path.
Only those who can create "chemical reactions" with others and combine their weapons to squash their rivals and show dominance will clear Second Selection.
|Stage||Team White||Team Red||Result|
|2nd||Isagi and Nagi (W)||Baro and Naruhaya (L)||5 - 4 (Baro joins the other team)|
|Shidou and Igarashi (W)||Reo and Kunigami (L)||Finished (Reo joins the other team)|
|3rd||Isagi, Bachira, Nagi (L)||Rin Itoshi, Jyubei Aryu, Aoshi Tokimitsu (W)||2 - 5 (Bachira joins the other team)|
|Unknown members (W)||Naruhaya, Baro, Nishioka (L)||5 - 4 (Nishioka joins the other team)|
|Isagi, Nagi, Baro (W)||Kunigami, Chigiri, Reo (L)||5 - 4 (Chigiri joins the other team)|
|4th||Isagi, Nagi, Baro, Chigiri (L)||Rin, Jyubei, Tokimitsu, Bachira (W)||4 - 5 (Isagi joins the other team)|
1st Clear Team: Rin, Jyubei, Tokimitsu, Bachira, Isagi
2nd Clear Team: Nagi, Baro, Chigiri, Zantetsu, Seira
3rd Clear Team: Karasu, Otoya, Yukimiya, Himizu, Yuzu
4th Clear Team: Nanase, Keki, Hiiragi, Sadouji
5th Clear Team: Niko, Hiori, Saramadara, Ishikari, Nishioka
6th Clear Team: Raichi, Gagamaru, Wanima, Shiguma, Tanaka
7th Clear Team: Shidou, Igarashi, Reo, Sokura, Kurona
Wild Card Participation: Rensuke Kunigami