Kothari represented India at the Commonwealth Games held at New Delhi. He swam in 50,100 m freestyle and also 4 × 100 m freestyle events. He swam the third leg in the 4 × 100 m freestyle relay which made history by qualifying for the finals for the first time in the history. The Indian 4 × 100 m freestyle relay quartet stood 6th in the finals.[5][6][7]
National Championships 2011
Kothari in the year 2011 ended a two decade gold drought for his state Gujarat by finishing at 1st position in the 50 m freestyle event.[8]
Kothari was part of the gold medal winning teams in 4 × 100 m Freestyle Relay at Asian Age group Championships in both 2011 and 2015 editions.[10][11][12]
17th Asian Games 2014
He swam in 50 m freestyle, 50 m butterfly and also the 4 × 100 m freestyle relay events. He finished at 14th position in 50
m Butterfly and 20th position in 50 m Freestyle. In the 4x100 freestyle relay, Kothari swam the lead off leg and the team finished at 6th position in the finals.[13]
70th Senior National Aquatics Championships 2016
Kothari, along with the Gujarat swimming team won the gold medal and set a national record in 4 x 50m Mixed Medley Relay event with the timing of 01:53.42.[14]
Kothari also won a gold medal in 50m Butterfly with the timing of 00:24.93, silver medal in 100m Freestyle with the timing of 00:51.94, silver medal in 50m Freestyle with the timing of 00:23.31, and bronze medal in 4x50m mixed freestyle relay event.[15][16][17]
12th South Asian Games 2016
Kothari won a gold medal in 4 × 100 m medley relay, silver medal in 50 m butterfly, and silver medal in 4 × 100 m freestyle relay.[18][19]
9th Asian Age Group Championship, Uzbekistan 2017
Kothari won a silver medal in 50m butterfly event with the timing of 00:24.84, and a bronze medal in 50m freestyle event with the timing of 00:23.28.[20]
He also won a silver medal in 4x100 Mixed FS Relay event (along with his teammates Sahil Chopra, Damini Gowda, and Shivani Kataria), and a bronze medal in 4X200m Relay FS event (along with his teammates Avinash Mani, Sahil Chopra, Sajan Prakash).[21][22]
18th Asian Games 2018
Kothari participated in the 4x100 m freestyle relay, Kothari swam the second leg and the team finished at 8th position in the finals creating a new Indian record in the morning heats.[23][24][25]