The task is to identify the mismatch in the list provided. Each option includes a person's name along with a sport. We will evaluate each option based on the known associations of these individuals to their respective sports.
Somdev Devvaman - Badminton: Somdev Devvarman is an Indian professional tennis player, not badminton. Therefore, this is a mismatch.
Gagan Narang - Shooting: Gagan Narang is an Indian shooter who has won multiple awards and medals in shooting competitions. This is a correct match.
Arjun Atwal - Golf: Arjun Atwal is an Indian professional golfer. Therefore, this association is correct.
Anita Sood - Swimming: Anita Sood is known for her achievements in swimming, including holding several national and international titles. This is also a correct match.
Based on the above analysis, the mismatch in the options is Somdev Devvaman - Badminton.