LAS VEGAS — O.J. Mayo, the third overall pick by the Memphis Grizzlies in last month's draft, made the most spectacular shot of his career last night at the NBA Summer League.

Mayo converted a desperation three-quarters court shot from 69 feet to beat the first-quarter buzzer against San Antonio. Mayo, who shot it with both hands from straight away, rattled it through the rim.

"I thought it wasn't going to make it to the rim," Mayo said. "I was surprised. After practices recently, we have been practicing half-court shots. I made a few there, and now I made one in a game."

Mayo, the highest draft pick playing at the 21-team Summer League, finished with 18 points on 5-of-17 shooting from the field in a 78-76 loss to the Spurs. Mayo was 6-for-6 from the free-throw line and had six rebounds.

The Grizziles and Mayo were playing their fourth game in four days, while the Spurs were making their debut in the their four-game Las Vegas visit.

"My body was a little bit soar," Mayo said. "I was getting the shots that I wanted."

Mayo's last field goal, a 3-pointer from the right arc with 3.1 seconds left in the game, cut the San Antonio lead to 77-76..

Besides Mayo's shot, fellow teammate and first-round pick Darrell Arthur from Kansas, highlighted the Memphis show. Arthur, who was drafted by Houston 27th and then had his rights dealt to the Grizzlies, had 23 points on 10-of-15 shooting from the field.

"He's a good player," Mayo said. "He plays hard. He's fresh off the national championship. He brings a winning mentality."

Ian Mahinmi, from France, led San Antonio with 18 points and seven rebounds, and former IUPUI star George Hill added 17 points — including 12-of-16 from the free-throw line.