Chávez bats and throws left-handed and is considered to have good fielding skills, speed, and the ability to hit to all parts of the field. He is best known for his outstanding catch in Game 7 of the 2006 NLCS, which is considered by many to be one of the best catches in MLB Postseason history. The catch was the start of a cult following for Endy and he is currently a fan favorite for Mets fans.
In his first six seasons, Chávez had a .269 batting average with 15 home runs and 148 RBI in 569 games played.
Endy's brother Ender Chávez has also played minor league baseball with affiliates of the New York Mets, Montreal Expos and Washington Nationals, and is currently playing for the St. Lucie Mets in the single "A" Florida State League.
In , Chávez joined the Montreal Expos organization, playing for the Ottawa Lynx. With Ottawa, Chávez was an International League all-star in 2002. Chávez finished out the season with the Expos affiliate Edmonton Trappers. In , Chávez moved to the New Orleans Zephyrs, the triple-A affiliate of the relocated Montreal Expos, now known as the Washington Nationals.
In 2005 Chávez played in only seven games for the team, now re-located to Washington, D. C. and re-named the Washington Nationals, before being traded to the Philadelphia Phillies. During his tenure in Washington, Chávez was given the mocking nickname of "Inning Endy" by Nationals fansites due to his tendency to swing at most pitches rather than "playing the count," often resulting in groundouts and popups.
Chávez's catch in Game 7 of the 2006 National League Championship Series is seen by many as one of the most remarkable plays in baseball history. In the top of the sixth inning, with the game tied 1-1, Chávez leaped over the -high left field wall to rob Cardinals third baseman Scott Rolen of a two-run home run. Chávez reeled the ball in and threw to cutoff man second baseman Jose Valentin, who threw to Carlos Delgado at first base, doubling off center fielder Jim Edmonds for an inning-ending double play. The catch was named the top post-season moment in the 5th annual This Year in Baseball Awards.
On July 13, , American International Group (the company whose sign is displayed on the left field wall at Shea Stadium where Chávez made the catch) sponsored a special Bobblehead Doll day to commemorate the catch. The sign is still on the wall in the same spot at the ballpark and is seen by many as an inspiration and ironic coincidence because the sign says "The Strength To Be There".
When regular left fielder Moisés Alou was placed on the DL, Chávez, in a reprise of the previous season, moved up to fill his spot. Sporting a .292 BA, and maintaining his slick fielding, Chávez was a more than adequate replacement. However, on June 6 2007 Chávez suffered a strained left hamstring while sprinting to first base on a double play ball. Two days later, he was placed on the 15-day DL. He returned from the DL on August 28.
During the 2007-2008 offseason, Chávez injured his right hamstring and right ankle while playing winter ball in Venezuela for Navegantes del Magallanes.
| Year | Age | Team | Lg | G | AB | R | H | 2B | 3B | HR | RBI | SB | CS | BB | SO | BA | OBP | SLG | OPS+ | TB | SH | SF | IBB | HBP | GDP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2001 | 23 | Kansas City | AL | 29 | 77 | 4 | 16 | 2 | 0 | 0 | 5 | 0 | 2 | 3 | 8 | .208 | .238 | .234 | 22 | 18 | 0 | 0 | 0 | 0 | 3 |
| 2002 | 24 | Montreal | NL | 36 | 125 | 20 | 37 | 8 | 5 | 1 | 9 | 3 | 5 | 5 | 16 | .296 | .321 | .464 | 102 | 58 | 7 | 1 | 0 | 0 | 0 |
| 2003 | 25 | Montreal | NL | 141 | 483 | 66 | 121 | 25 | 5 | 5 | 47 | 18 | 7 | 31 | 59 | .251 | .294 | .354 | 65 | 171 | 9 | 3 | 3 | 0 | 7 |
| 2004 | 26 | Montreal | NL | 132 | 502 | 65 | 139 | 20 | 6 | 5 | 34 | 32 | 7 | 30 | 40 | .277 | .318 | .371 | 74 | 186 | 12 | 2 | 0 | 1 | 6 |
| 2005 | 27 | WSN/PHI | NL | 98 | 116 | 19 | 25 | 4 | 3 | 0 | 11 | 2 | 2 | 7 | 14 | .216 | .260 | .302 | 45 | 35 | 7 | 0 | 0 | 0 | 3 |
| 2006 | 28 | New York | NL | 133 | 353 | 48 | 108 | 22 | 5 | 4 | 42 | 12 | 3 | 24 | 44 | .306 | .348 | .431 | 101 | 152 | 11 | 2 | 3 | 0 | 7 |
| 2007 | 29 | New York | NL | 71 | 150 | 20 | 43 | 7 | 2 | 1 | 17 | 5 | 2 | 9 | 16 | .287 | .325 | .380 | 84 | 57 | 5 | 1 | 0 | 0 | 5 |
| 2008 | 30 | New York | NL | 131 | 268 | 30 | 72 | 10 | 2 | 1 | 12 | 6 | 1 | 17 | 22 | .269 | .310 | .332 | 71 | 89 | 9 | 2 | 3 | 0 | 6 |
| Totals: | 771 | 2,074 | 272 | 561 | 98 | 28 | 17 | 177 | 78 | 29 | 126 | 219 | .270 | .311 | .369 | 75 | 766 | 60 | 11 | 9 | 1 | 37 | |||