As with many sumo wrestlers, he initially competed under his family name, Kogawa, under which he won the third-division championship in an eight-way playoff in March 1997. Upon reaching the second highest
jūryō division in November 1997, he was given the
fighting name of Wakanosato, reminiscent of his stablemaster, former
yokozuna Takanosato. He entered the top
makuuchi division for the first time in May 1998. He recorded his first
kinboshi or gold star win against
yokozuna Wakanohana in the November 1998 tournament, but the next day he broke his ankle in a match with
Musōyama and had to miss the last day of the tournament and all of the next. He suffered a more serious injury in November 1999, rupturing
anterior cruciate ligaments. He sat out two successive tournaments after having surgery and was demoted to the
jūryō division. He won consecutive
jūryō championships upon his comeback, in May and July 2000, and was promoted back to
makuuchi in September. He quickly made the titled ''
san'yaku ranks, making komusubi in November 2000 and recovering from 2–6 down to finish 9–6. As a result, he was promoted to sekiwake'' for the first time in January 2001. In his early top division career, Wakanosato was considered a promising candidate for
ōzeki. From January 2002 until January 2005, he spent 19 consecutive tournaments ranked at either
komusubi or
sekiwake, an all-time record. However, he was never able to break through the "great barrier" (the literal meaning of
ōzeki), just failing to attain the necessary 33 wins over three tournaments. He was runner-up in the January 2003 tournament, and again in September 2003, where his 11–4 score was probably his best chance to make
ōzeki. However, he could only manage seven wins in the following tournament. He was never able to consistently beat the top ranked wrestlers, being unable to beat Takanohana in nine attempts and winning only five times out of 32 meetings against
ōzeki Chiyotaikai. He initially had an excellent head-to-head record against
Hakuhō, defeating him the first six times they met. However, the last of these victories came in 2005 and he subsequently lost eleven in a row against Hakuhō. He was awarded ten
sanshō or special prizes for good performances in tournaments during his career. In later years, on the
dohyō he again had injury problems, being forced to withdraw from his final ''san'yaku
-ranked tournament in September 2005 and missing all of the next. He defeated yokozuna
Asashōryū on the second day of the 2006 May tournament, his first kinboshi
in 45 tournaments (only Kirinji, with 47 tournaments, has had a longer wait between kinboshi
) but he could only manage a 6–9 record overall. He was then again forced to sit out all of the September 2006 tournament and fell to the second division once again. However, he made something of a comeback in May 2007, turning in a strong 10–5 record at maegashira'' 7. He won his 600th career bout in September 2007, and turned in another good performance in May
2008, again finishing on 10–5. He withdrew from the March
2009 tournament after breaking a
metatarsal bone in his right foot during his 11th day bout with
Kotoshōgiku. He had surgery on 8 April which put him out of action for at least two months, meaning he had to sit out the following tournament in May. He came back very strongly in July, winning his fourth
jūryō championship with a 14–1 record. He reached
maegashira 1 in March 2010, his highest rank in over four years. After that he comfortably maintained a position in the mid-to-upper
maegashira ranks until he was injured in the November 2011 tournament, resulting in yet another fall to
jūryō. However he immediately returned to
makuuchi after scoring 11–4 in January 2012. After a poor 4–11 record at
maegashira 15 in September 2013, Wakanosato was once again demoted to
jūryō, but for the first time for a non injury-related reason. He was ranked in
makuuchi only one more time after that, in the July 2014 tournament. ==Retirement from sumo==