Guevara is nicknamed El Lobo. He was named the tournament MVP after leading Honduras to a surprise third place finish in the 2001 Copa America, the Honduran team (a last minute call-up when Argentina dropped out a day before kickoff on 11 July, 2001) arrived after the tournament started and just few hours before its first game with barely enough players. In the quarterfinal round, Honduras defeated Brazil (the favorite to win the tournament) by a score of 2-0. The defeat sent the Brazilians home and the Hondurans advanced to the semifinals.
Currently Guevara is the captain and all time caps leader of the Honduran national team. He has scored 25 goals in 109 caps.
Prior to signing with the MetroStars, Guevara played all over the world: in Honduras with Motagua, Spain with Real Valladolid, Mexico with Toros Neza and Zacatepec, and Costa Rica with Saprissa. He was signed by the MetroStars on April 11, 2003.
Guevara immediately stepped into the MetroStars team and produced. Although he finished the season with only three goals and ten assists (he added another goal in the playoffs), he became the focal point of the team; they were successful when the offense flowed through him. Guevara added four key goals and two assists in the U.S. Open Cup, leading the Metros to the first final of any sort in the team's history.
Guevara tallied ten goals (six on penalties) and ten assists in his sophomore season. Guevara not only tied for the league lead in scoring, he was also named MLS's MVP. In 2005, Amado procuded another solid season for the Metros, with 11 goals and 11 assists, and added a goal in the playoffs.
In early 2006, a conflict arose between Guevara and the MetroStars. The club allowed him to train with Motagua, but Amado played for the Honduran club in a number of friendly matches, which might or might not have been permitted. Guevara lashed out in the Honduran press at the Metros' GM Alexi Lalas. But the two patched things up and Guevara remained in New York for the 2006 season. He received his green card in March 2006 and no longer counts as a foreign player in MLS. During the last game of the re-branded Red Bull New York season, Guevara scored three goals, a hat trick, to help them win 3-2 and reach the playoffs.
Following the 2006 season, Guevara was traded to Chivas USA in exchange for a designated player slot. After playing just four games for the club, Chivas USA coach Preki told MLSnet.com that "I have a vision of where the club is going and [Guevara's] not part of it." This comment came following consistently poor performance on the field and an incident in which Guevara was sent off for pushing an assistant referee. Attempts to deal the midfielder to Toronto FC, Colorado Rapids, FC Dallas, and Columbus Crew were all shot down by Guevara. Guevara then accepted a loan move to his former club Motagua for the remainder of the 2007 season. He quickly recovered the form that made him a star in the US top flight, leading the Honduran club to the Central American Club Championship Copa Interclubes UNCAF 2007 defeating regional and Costa Rican giant Saprissa 2-1 on aggregate on December 5, 2007.
On April 9, 2008, Guevara was traded to Toronto FC for a 2009 and 2010 draft pick. He made his debut for Toronto FC in his new team's first win of the 2008 season, assisting Danny Dichio for the first goal of the game against the Los Angeles Galaxy. On August 3, 2008, Guevara was shown a straight red card by referee Baldomero Toledo after allegedly elbowing FC Dallas player Pablo Ricchetti in the face. The elbow drew blood, and Guevara was immediatly thrown from the game. He received a 2 game suspension.