Yamamoto Keitaro (山本 桂太朗) is Unlimited Cliffer No. 5 and has competed on SASUKE five times. He holds the record of clearing Muscle Park in just under 26 seconds.
In the Trials at Muscle Park, he won a spot in SASUKE 20 and was the only cliffer to do so (even though Matsuda Tsuyoshi also competed in the tournament). During SASUKE 20, he made it through the first three obstacles and sized up the Jumping Spider only to fail after getting onto the walls.
He also competed in the SASUKE 21 Trials but timed out on the Sandbag Lift. He has also competed in the SASUKE 22 Trials and SASUKE 23 Trials, failing to complete the 800m race in time and failing to hold onto the bar the longest respectively.
He returned once more in SASUKE 34 after a 4 tournament absence wearing #74. In the tournament, he cleared the First Stage again, but in the Second Stage he failed the Reverse Conveyor, making it to the belt and falling off immediately after his time ran out. Though his run was digested, it was evident that he had struggled with the Backstream due to his low time after clearing it.
In SASUKE 36 he wore his highest number to date, #93. His First Stage run was digested but he cleared the stage was 12 seconds left. His Second Stage run was also digested, but it was shown that he timed out on the Wall Lifting on the third wall. He is currently the only competitor to have failed the Second Stage four consecutive times.
In SASUKE 37, he wore #90 and it looked like he was gonna clear the first stage for the fourth straight time. But surprisingly, he ended up timing out on the Soritatsu Kabe, possibly due to the bad weather. As such, his failed stage 1 for the first time since his debut in SASUKE 20.
|20||1942||Failed Jumping Spider (First Stage)|
|29||91||Failed Backstream (Second Stage)||Digest. Time Out.|
|34||74||Failed Reverse Conveyor (Second Stage)||Digest. Time Out.|
|35||89||Failed Spider Drop (Second Stage)|
|36||93||Failed Wall Lifting (Second Stage)||Digest. Time Out.|
|37||90||Failed Soritatsu Kabe (First Stage)||Time Out.|
|2||19||Failed Cannonball (First Marine Stage)|