Uganda’s Joshua Cheptegei added the elusive Olympic 10,000 metres gold to his three world titles while the United States 4x400m mixed relay stormed into the final in world record time on Friday at the Paris Games. World record holder Cheptegei won from the front in an Olympic record 26 minutes 43.14 seconds, after getting 5,000m gold and 10,000m silver at Tokyo 2020. Berihu Aregawi saved face for Ethiopia with a late surge for silver, three-tenth adrift. Grant Fisher took bronze two-hundredths back, a first medal for the United States in 60 years since Billy Mills’ 1964 gold. Ethiopia’s Selemo…