The four-time All-Star checked in with 2,530,713 votes, outdistancing Chicago's Willson Contreras (1,216,513 votes), St. Louis' Yadier Molina (1,068,485), Los Angeles' Yasmani Grandal (749,923) and Washington's Matt Wieters (680,644).
Posey's .340 batting average entering Monday eclipsed the .336 figure he posted when he won the NL batting title in 2012. He also owns a .421 on-base percentage. Both figures ranked third in the Major Leagues.
"It's no surprise to me what he's doing. He's always thinking of ways to get better," Giants hitting coach Hensley Meulens said.
Posey has thrived by taking control of his plate appearances. According to Statcast™, he has seen the highest percentage of pitches while ahead or even in the count.
Posey has been precise as well as productive. Statcast™ pointed out he has missed on 13 percent of his swings with two strikes on the count, the ninth-lowest two-strike whiff rate in the Majors among 180 qualified hitters.
Posey, who also started the Midsummer Classic in 2012, provided early indications that he would thrive this season when he batted .313 with two home runs as a member of victorious Team USA in the World Baseball Classic.
Posey is the lone Giant to appear among the top five vote recipients at any position.
Fans may cast votes for starters at MLB.com and all 30 club sites -- on computers, tablets and smartphones -- exclusively online using the 2017 Esurance MLB All-Star Game Ballot until Thursday at 8:59 p.m. PT. On smartphones and tablets, fans can also access the ballot via the MLB.com At Bat and MLB.com Ballpark mobile apps. Vote up to five times in any 24-hour period for a maximum of 35 ballots cast.
The Esurance All-Star Selection Show will take place on Sunday at 4 p.m. PT on ESPN. Following the unveiling of the 2017 All-Star starters, reserves and pitchers, fans should return to MLB.com and cast their 2017 Esurance MLB All-Star Game Final Vote for the final player on each league's All-Star roster. Then on Tuesday, July 11, while watching the 2017 All-Star Game presented by Mastercard live on FOX, fans may visit MLB.com to submit their choices for the Ted Williams Most Valuable Player Award presented by Chevrolet with the 2017 MLB All-Star Game MVP Vote.
The 88th Midsummer Classic, at Marlins Park in Miami, will be televised nationally by FOX Sports; in Canada by Rogers Sportsnet and RDS; and worldwide by partners in more than 160 countries. ESPN Radio and ESPN Radio Deportes will provide exclusive national radio coverage, while MLB Network, MLB.com and SiriusXM will have comprehensive All-Star Week coverage. For more information about MLB All-Star Week and to purchase tickets, please visit AllStarGame.com and follow @AllStarGame on social media.