"R" Name Sports

RA
Racquetball
Rafting

RI
Rink Hockey
River Rafting

RO
Robot Sports
Rock Climbing
Rodeo
Rogaining
Roll Ball
Rolle Bolle

Roller
Roller Basketball
Roller Dancing
Roller Derby
Roller Figure Skating
Roller Hockey
Roller Hockey Pick Up
Roller Hockey Street
Roller Skating
Roller Skating Fitness
Roller Skating Indoors
Roller Skating Outdoors
Roller Skating Recreational
Roller Skating Slalom
Roller Synchronized Skating
Rollerblading
Rollerjoring
Rollerskiing
RollerSoccer

ROP-ROW
Rope Climbing
Ropes Courses
Roping
Rounders
Row Boating
Rowing
Rowing Indoors
Rowing Olympic
Rowing outdoors

RU
Rugby
Rugby League
Rugby Sevens
Rugby Union
Running

References:

askaboutsports.com - about - a name sports - archive