Mauriello threw and batted right-handed, and was listed as 6 feet 3 inches (1.91 m) tall and 195 pounds (88 kg). He climbed the ladder in the Dodger organization, winning 18 games (and losing eight) for the 1955 Mobile Bears of the Double-A Southern Association. His 1958 call-up came after a minor-league year split between Double-A and Triple-A. In his MLB debut September 13, a starting assignment against the Pittsburgh Pirates at Forbes Field, he lasted only one-third of an inning; of the five batters he faced, three made hits and a fourth took a base on balls. Charged with three earned runs, he was tagged with the Dodgers' eventual 9–4 defeat. But, six days later, he started against the Chicago Cubs at Wrigley Field, permitted only one run on five hits, and racked up his first MLB victory, 5–1. Eight days later, at the Los Angeles Memorial Coliseum, he came in against the Cubs as a middle reliever in the third inning of a 1–1 deadlock. Mauriello allowed only one hit through three innings, as the Dodgers built a 4–1 lead. But in the sixth frame, he gave up a two-run homer to Bobby Thomson, and exited the game with the Dodgers still ahead, 4–3. The Los Angeles bullpen could not hold the advantage, though: Chicago rallied in the ninth inning to win 7–4 in what would be Mauriello's final big-league game.
Mauriello retired from baseball after the 1960 season, his eighth in the Dodger system. He earned his undergraduate degree from USC in electrical engineering in 1961, then a master's from UCLA in computer design, and built a successful career in the computer industry.
As a major leaguer, he split two decisions, and allowed six earned runs on ten hits and eight bases on balls in 11.mw-parser-output .frac{white-space:nowrap}.mw-parser-output .frac .num,.mw-parser-output .frac .den{font-size:80%;line-height:0;vertical-align:super}.mw-parser-output .frac .den{vertical-align:sub}.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}2⁄3 innings pitched, with 11 strikeouts and a 4.63 earned run average.

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