At WAVE NAMI 1, the first event of 2021 from January 1, she competed in an 11-woman battle royal also involving Kaori Yoneyama, Rin Kadokura, Yuki Miyazaki, Yumi Ohka and others.

36 from January 13, 2018, Watanabe competed in a 16-woman battle royal to determine the no.1 contender for the Wave Single Championship also involving notable opponents such as the winner of the match Misaki Ohata, Manami Katsu, Ryo Mizunami, Ayako Hamada, Asuka and others.

[17] At Stardom in Korakuen Hall on June 5, 2022, Saki teamed up with her Color's stablemates Hikari Shimizu and Yuko Sakurai to fall short to Cosmic Angels' Unagi Sayaka, Tam Nakano and Mina Shirakawa in a loser joins enemy unit.

[20] At Stardom 5 Star Grand Prix 2022, she fought in the "Red Goddess" block, scoring a total of 10 points after competing against Tam Nakano, Himeka, Maika, Risa Sera, AZM, Utami Hayashishita, Koguma, Syuri, Saki Kashima, Mai Sakurai, Momo Kohgo and Unagi Sayaka.

[22] At Stardom in Showcase vol.2 on September 25, 2022, Saki teamed up with Hikari Shimizu and fought Tam Nakano and Natsupoi, and Mina Shirakawa and Unagi Sayaka in a Cosmic Rule Three-Way Match.