Career
He started playing tennis at the age of 3. He was ranked Number.1 in all age groups in India from the under 12s to the under 18s. In the same year he also led the Indian under 14 team to finish as runners up in the Asia/Oceania boys under 14 World Junior Tennis event, thus qualifying for the World finals to be held in Czechoslovakian Republic.
In the world finals as India"s no.1 player Karan lost the first match to the then 14 year old Rafael Nadal as India lost to Spain 0-3.
He was named Asia"s no.1 Under 14 boys player in 2000. In 2003, he turned professional.
He reached the semi-finals of the Australian Open Junior Championship in 2004. In his first full year on the professional circuit Karan went from a ranking of 1100 in January to 350 at the end of the year.
In 2007 at the Association of Tennis Professionals Chennai Open, Karan beat Thiago Alves from Brazil in the first round and lost to world no.2 Rafael Nadal 64 61 in the second round.
And Asian Games in 2006 and 2010. Winning the Bronze medal in the 2010 edition In 2008 Karan underwent a lower back operation which kept him out of the game for more than 18 months.
Within 15 months of his comeback Karan reached his career best singles ranking of 284 in 2011 February.
In 2012 Rastogi decided to quit his playing career and begin a coaching career. He completed an A level coaching course from GPTCA and is an Association of Tennis Professionals certified tennis coach.
In 2012 November Karan joined forces with the Hong Kong Tennis Association to coach and help all their national teams. Karan currently is coaching the various national teams of Hong Kong.
PERSONAL LIFE.