A total of 4,251 runners finished the 64th edition of the San Blas Half Marathon in Coamo on Sunday. (Facebook via Medio Maratón San Blas) By THE STAR STAFF Kenyan Peter Njeru successfully defended his title at the 64th San Blas Half Marathon in Coamo on Sunday with a time of one hour, 3 minutes and 13 seconds (1:03:13), crossing the finish line over half a minute ahead of his closest challenger. In the women’s race, Werkuha Getachew of Ethiopia was the winner by a similar margin, with a time...