Dyson singled to open the inning. Chris Medlen laid down a bunt that Mattheus fielded cleanly but threw the ball down the line in rightfield. Dyson beat the throw by Jay Bruce standing up. Medlen advanced to second on a wild pitch. A single by Alcides Escobar sent Medlen to third. Matthues was late covering first on a high chop that Brandon Phillips fielded off the bat of Ben Zobrist as Medlen scored.
Greg Holland earned his 27th save with a scoreless 13th inning.
The Reds' last extra-inning win was on June 15 when they beat Pittsburgh 5-4 in 13 innings.
In 2008 a younger Edinson Volquez with 17 Major League starts under his belt joined an even younger Johnny Cueto in the Cincinnati Reds' starting rotation.
Along with Homer Bailey, the trio formed the back end of a youthful starting rotation.
Reds' rookie pitchers have started 19 consecutive games. It is the most since the St. Louis Cardinals also had 19 straight games started by rookies. The rookie designation was established in 1958.
Volquez, who signed with the American League champion Royals this past winter, started against his former team that traded him to San Diego before the 2012 season.
Eugenio Suarez belted his eighth home run of the season off Volquez in the first inning.
Iglesias, in his first full year of baseball in the United States, completed seven innings of scoreless, three-hit baseball. He turned in his fourth straight quality start and has an active streak of 13 scoreless innings.
His teammates threatened Volquez twice, loading the bases with two outs in the sixth after Billy Hamilton hit into a double play with two men on in the fifth. Volquez allowed one run on four hits in six innings.
Iglesias turned over the skimpy lead over to J.J. Hoover, who had three blown saves in a span of seven games but has a tiny 1.17 ERA in his last 48 appearances.
The Royals put two men on with one out but Suarez started the Reds' third double play with a nifty pick in the hole at shortstop.
Ryan Madson, who was with Cincinnati for one season but never pitched due to shoulder problems, pitched a scoreless eighth for Kansas City. Chris Young walked Joey Votto but kept the Reds close in his scoreless frame.
Aroldis Chapman entered in the ninth to attempt his 25th save in 26 tries.but Ben Zobrist hit a 2-1 pitch into the left-field stands to tie the game. Lorenzo Cain singled as the next batter. Chapman struck out Eric Hosmer. Cain stole second and third while Salvador Perez was at the plate. Perez hit a one-hopper to Brandon Phillips at second base. Phillips threw behind Cain at third. The Reds didn't execute a clean rundown and Cain was ruled safe at home but the Reds argued Cain ran out of the base lines to avoid the tag. The call was reversed after a challenge that lasted 3:26.
Chapman sent the game to extra innings by getting Mike Moustakas to ground out with the go-ahead run on secondbase.
Hamilton's quickness kept the Royals from scoring in the 11th. He grabbed Alcides Escobar's line drive in the right centerfield gap on a short hop on a dive. Hamiltion got to his feet and the throw beat Escobar to secondbase by 15 feet. Eric Cooper, the second base umpire, ruled Escobar out on Suarez's tag. The Royals challenged but the call was upheld after a 2:56 review. Royals manager Ned Yost was ejected for continuing his objection.
Professionally edited by ML Schirmer
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