During periods of intense training or competition, aim for three to five grams of carbohydrate per pound of body weight (465-775 grams per day for a 155-pound player). Breads, cereals, rice, pasta, fruits, and vegetables are all good primary sources of carbohydrates that should be regularly included in a tennis player’s diet.
https://www.usta.com/en/home/improve/tennis-health---fitness/national/a-player-s-diet...