The Washington Nationals selected the contract of shortstop Trea Turner from Triple-A Syracuse on Friday and placed first baseman/outfielder Tyler Moore on the 15-day disabled list, retroactive to Aug. 19, with a left ankle sprain. Additionally, right-handed pitcher Aaron Barrett (right elbow sprain) was transferred to the 60-day DL.

Turner joins the Nationals for the first Major League assignment of his career. Ranked the №9 (Baseball America) and №12 (MLB.com) best prospect in all of baseball, Turner arrives in the Major Leagues having hit .322 with a .370 on-base percentage and a .458 slugging percentage in 116 minor league games this season.

Acquired from the San Diego Padres on June 14 — completing the Dec. 18, 2014 three-team trade in which Washington acquired right-handed pitcher Joe Ross and a Player to be Named from the Padres, and sent outfielder Steven Souza Jr. and Minor League left-handed pitcher Travis Ott to the Tampa Bay Rays — Turner has played at two different levels for three different teams this year.

The speedy infielder hit .322 (73-for-227) with 13 doubles, three triples, five home runs, 35 RBI, 24 walks, 11 stolen bases and 31 runs scored in 58 games for San Diego’s Double-A affiliate, the San Antonio Missions, to open his 2015 season. He posted a .385 on-base percentage, a .471 slugging percentage and an .856 OPS along the way.

After officially joining the Nationals’ organization, Turner hit .359/.366/.513 with four doubles, one triple, four RBI, one walk and four stolen bases in 10 games with Double-A Harrisburg. Turner, 22, was promoted to Triple-A Syracuse on June 26, and has hit .314/.353/.431 with seven doubles, three triples, three home runs, 13 walks, 14 stolen bases and 15 RBI in his first experience (48 games) at the highest level of the minor leagues.

Turner joined right-handed pitcher Lucas Giolito in representing the Nationals at the Sirius/XM MLB All-Star Futures Game in Cincinnati in July. He went 2-for-2 with a double, triple, and two RBI in the annual prospect showcase.

A first-round selection in the 2014 First-Year Player Draft (№13 overall), Turner entered the 2015 season rated as the №2 prospect in the Padres’ chain and the №65 prospect in all of baseball, per Baseball America, and his stock has risen considerably this season.

Turner boasts advanced speed and base running ability. According to Baseball America, Turner had the “Best Strike-Zone Discipline,” and was the “Best Athlete” and “Best Defensive Infielder” in the San Diego Minor League system prior to his trade to Washington.

Moore, 28, is hitting .200 for the Nationals this season with 10 doubles, four home runs and 22 RBI. Appearing predominantly off the Nationals’ bench (Moore has started 28 games, 1B: 17; OF: 11), the Mississippi native has four pinch hits and one pinch-hit home run in 2015.