However, that has not been the case for each when facing the other's ballclub.
Kennedy and Richard each look to continue their respective success against their opponent when the visiting Padres try to match a season high with a sixth consecutive victory Saturday night against the Diamondbacks.
Kennedy (11-10, 4.24 ERA) is 6-0 with a 2.34 ERA in nine starts versus San Diego, including 1-0 with a 3.46 ERA in two this season. The right-hander, though, wasn't at his best July 4 when he allowed four runs and nine hits in seven innings of an 8-6 home loss to the Padres.
He gave up 11 runs - eight earned - and four homers over 10 innings while losing his two previous starts overall before yielding a run and overcoming five walks in six innings of an 8-1 victory at Houston on Sunday.
"I put a lot of hitters in hitters' counts and just luckily got out of it," Kennedy told the Diamondbacks' official website.
Kennedy is 3-0 with a 3.98 ERA in his last five home starts in which he's received an average 8.53 runs of support.
Richard (10-12, 3.73) is 4-0 with a 3.89 ERA in six starts versus Arizona, including 1-0 with a 1.76 ERA in two 2012 outings. He allowed two runs in 8 2-3 innings of a 6-2 win July 2 at Chase Field, where he is 2-0 in three starts despite a 5.00 ERA.
Though the left-hander is 0-3 with a 6.00 ERA in four road starts since that victory at Arizona, he hopes to build on Sunday's effort when he gave up a run in eight innings of a 7-1 home win over San Francisco.
"He continues to go out and pound the strike zone and get ahead of guys," teammate Cameron Maybin told the Padres' official website. "He's just fearless. You love playing behind a guy like that."
Richard looks to help San Diego (57-70) continue its success after winning 5-0 at Arizona on Friday. Eric Stults threw seven strong innings and drove in a career-best three runs with a pair of two-out hits for the Padres, who have outscored the Diamondbacks 35-19 during a franchise-best five-game winning streak at Chase Field.
San Diego outfielder Chris Denorfia , who hit a solo homer and drove in two runs Friday, is batting .425 (17 for 40) in 12 games at Arizona. He's 3 for 9 against Kennedy.
Chris Young had two of the four hits for the Diamondbacks, who have dropped five of their last six series openers.
Arizona slugger Justin Upton , who was reported to have been claimed off waivers by an unidentified team this week, could miss a fourth straight game because of a nagging hamstring injury.
"We're going to give him another day," manager Kirk Gibson told the Diamondbacks' official website.
Though Upton is batting .273 with a disappointing nine homers and 49 RBIs, he is 5 for 11 with three RBIs in his last three games. He's 5 for 15 versus Richard.
|San Diego Padres|
|August 23, 2012||Jason Marquis||15-Day DL||Fractured left wrist|
|August 17, 2012||Nick Hundley||Day-to-Day||Bruised right knee|
|August 16, 2012||Nick Hundley||15-Day DL||Bruised right knee|
|August 11, 2012||Huston Street||15-Day DL||Strained left calf|
|July 31, 2012||Yasmani Grandal||15-Day DL||Strained oblique|
|July 31, 2012||Yasmani Grandal||15-Day DL||Strained oblique|
|August 21, 2012||Justin Upton||Day-to-Day||Left game - Tight hamstring|
|August 17, 2012||Jason Kubel||Day-to-Day||Neck stiffness|
|August 14, 2012||Takashi Saito||15-Day DL||Strained left hamstring|
|August 09, 2012||Willie Bloomquist||15-Day DL||Lower back stiffness|
|August 09, 2012||Josh Collmenter||15-Day DL||Ulcers|
|August 06, 2012||Henry Blanco||15-Day DL||Sprained left thumb|
PHOENIX (AP) -- Yonder Alonso knew the San Diego Padres had Ian Kennedy on the ropes, so he delivered a pair of knockout blows.
Alonso hit the last of San Diego's three solo homers and added a two-run single to lead the streaking Padres past the Arizona Diamondbacks 9-3 on Saturday night.
"For a while it seemed like I was trying to guide the ball every time," Alonso said. "Then I realized you don't have to work so hard to do it, just get a good swing and maybe get a single or double."
Chase Headley and Carlos Quentin also homered for the Padres, who have won six in a row.
Clayton Richard (11-12) allowed three runs and seven hits over eight innings, improving to 5-0 in seven career starts against Arizona. He struck out four and walked two.
Richard leads the National League with 184 innings pitched.
"That tells you a couple of things," Padres manager Bud Black said. "First, he's performing to where we're not taking him out. And his pitch count is such to allow him to stay in. He's not pitch-counting himself out."
Justin Upton celebrated his 25th birthday with his first career inside-the-park home run and Aaron Hill also connected for the slumping Diamondbacks, who have lost two straight and four of six.
Arizona is 4-9 in its last 13 home games after winning eight straight at home in July.
"They out-executed us in every aspect of the game," Diamondbacks manager Kirk Gibson said. "There you have it."
Kennedy (11-11) faded in the sixth and allowed six runs on four hits over 5 1-3 innings. He walked four, hit a batter with a pitch and struck out six.
Alonso's home run just over the right-field fence leading off the fifth put San Diego ahead 3-2, and the Padres quickly added to the lead.
Everth Cabrera walked to start the sixth and was sacrificed to second. Kennedy then walked Headley, hit Quentin in the middle of the back with a pitch and walked Yasmani Grandal to force home Alonso and make it 4-2.
Alonso followed with a sharp single to right, scoring Headley and Quentin for a 6-2 lead.
"Definitely, he was struggling," Alonso said. "He was trying to find the zone and I knew either I had to wait for my pitch or be more aggressive. He threw a pitch over the plate and I got good wood on it."
San Diego added three more runs in the eighth against Mike Zagurski and Brad Ziegler .
"They were putting pressure on us," Upton said. "It is pretty tough to win like that. They did a great job of standing on the gas pedal."
Hill homered in the bottom of the eighth for the Diamondbacks.
Headley homered just inside the right-field foul pole with two outs in the first to give the Padres a 1-0 lead.
After Paul Goldschmidt walked leading off the second, Upton lofted a pitch to right-center and the ball hit just above the base of the wall and caromed wildly back toward straightaway center. Upton was rounding third base before Cameron Maybin could run down the ball and slid safely across the plate with yards to spare to put the Diamondbacks up 2-1.
"I told him it was a birthday carom," Maybin said, smiling.
Quentin tied it with a home run onto the concourse overhanging the center-field wall.
NOTES: Upton became the first player to hit an inside-the-park home run on his birthday since Hall of Famer Lou Brock for St. Louis in 1976 against the Padres. ... Quentin was hit by a pitch for the 16th time this season, setting a franchise record. ... Kennedy is tied with Dodgers RHP Joe Blanton for the NL lead with 26 home runs allowed. ... Diamondbacks C Miguel Montero threw out Cabrera trying to steal second in the third, the first such runner thrown out by an Arizona catcher since July 22. ... Upton's inside-the-park home run was the Diamondbacks' second this season and the ninth in franchise history. ... RHP Edinson Volquez (8-9) pitches Sunday for San Diego against Joe Saunders (6-10) in the series finale. Volquez permitted one run in his last start, snapping a streak of four straight with four or more runs allowed. Saunders is 1-4 with a 6.60 ERA in his last five starts.