Rocket Jockey

From back of book: "IT WASN'T HIS SHIP, OR HIS JOB, OR HIS PROBLEM...but suddenly Jerry Blaine was behind the controls of Earth's Last Hope and blasting off for the galaxy's most savage space race. His brother Dick had planned to be the rocket jockey in the family, but a freak accident had taken him out of the running, leaving only Jerry to carry on.

Now, speeding from planet to planet, moon to moon, wrestling with dangerous unknown forces of space and attempting to outwit the invidious Martian contenders, Jerry realized that what was at stake was more than a racing championship for Earth...what was at stake was his life!"