Question: Who is this American professional baseball player for the Washington Nationals of Major League Baseball (MLB) who is also Scott Boras's client?
Sentence (from "Scott Boras"): Boras has brokered many record-setting contracts since 1982, and many of his clients, including Shin-Soo Choo, Jacoby Ellsbury, Prince Fielder, Matt Holliday, Alex Rodriguez (until 2010), Max Scherzer, and Jayson Werth are among the highest paid in the game.
Relevant evidence: Yes