RIO DE JANEIRO -- Never did Karch Kiraly expect the womens volleyball Group B winner to go unblemished.He probably had little idea captain Christa Dietzen would be the one to deliver during the latest impressive U.S. victory, either.Dietzen made the final kill of the third set and provided a big lift off the bench, helping the top-ranked Americans (5-0) put themselves in prime position in this Olympic tournament. They responded from a one-set deficit to beat China 22-25, 25-17, 25-19, 25-19 on Sunday, and now will face Japan in the Rio de Janeiro Games quarterfinals Tuesday at Maracanazinho arena. China must face two-time defending champion Brazil (5-0), which swept Russia in Sundays late match and is yet to drop a set.All along, Dietzen has accepted her role in Rio -- limited or otherwise, like Sunday.I love whatever role Im given, I think its great to come off the bench, to be a starter, said the 29-year-old Dietzen, who has been working closely with team high-performance psychologist Michael Gervais during this trip. Its important for athletes to develop their ability to be their best from any position. When the team needs me, Im ready to go in.Dietzen, nicknamed Mom by her teammates for all her care and used sparingly so far in Brazil, delivered. Her teammates couldnt have been more proud to see it.This team has just so much trust in her as our captain, and with the experience that she has shes a real stabilizing influence, Kiraly said.They joke shes a caged lion, too.We call her mom, and shes more of a mom to me than anybody on the team, Kelsey Robinson said. She has been someone who has taken me under the wing since my first year. Wed go to lunch, shed take me to dinner. ... I love the way she plays, I love the way she fights. For her to be such a great teammate in the role shes been asked to do and get her shot tonight, Im so proud of her.China coach Jenny Lang Ping, who once coached the Americans, and Kiraly are both looking to become the first to win volleyball gold as a player and coach.Kiraly certainly isnt getting ahead of himself. Sure, the U.S. took a nice step forward to the goal of reaching the top of the medal podium for the programs first gold ever.The Americans, silver medalists the past two Olympics behind Brazil, dropped five sets in all.Im more surprised that somebody went undefeated than they didnt, Kiraly said. We got pushed a lot, and that was all good for us.This marked the 11th meeting between the countries since the U.S. beat China for the 2014 world championship title. The Americans have won eight of 12 meetings since then. After a June 12 loss in China, the Americans bounced back with victories on June 26 in Hong Kong and July 8 in Bangkok.On Sunday, Dietzen did the very thing veteran players do when called upon: She had herself ready for the moment when needed.Its very important for her to help their team when shes a substitute for the younger players, and the younger players are probably more calm to play, Ping said. Shes a great blocker, too. Every time, she gives our attack lots of trouble.Earlier, Italy captain Antonella Del Core said a tearful Olympic goodbye.She thanked everyone in the crowd over the public address system after her final match with the team and a straight-set win against Puerto Rico. Her Italian teammates threw her in the air again and again, and had written on their arms, Grazie Cap (hashtag)15 with a heart. Authentic Shelby Miller Jersey . 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SRINGFIELD, Ill. -- Justin Haley became the youngest winner in more than 80 years of championship racing at the Illinois State Fairgrounds, winning the ARCA Racing Series event Sunday at 17.Racing a stock car on dirt for the first time, Haley, from Winamac, Indiana, held off Illinois favorites A.J. Fike and Ryan Unzicker during a green-white-checker finish on the mile track.I tried to hold him (Unzicker) off the best I could, Haley said. I stayed strong through that first corner. I was very impressed how well he ran us, up on the outside of us. We almost wrecked down the backstretch, but we held onto it.Driving Mason Mitchell Motorsports No. 98 Chevrolet, Haley surpassed Justin Allgaier -- the 2006 champion in his hometown event at 20 -- as the youngest major winner at the track that opened in 1934.Im a little surprised, Haley said. Never would have dreamed in a million years my first ARCA win would come on a dirt traack, but to be here in victory lane is super cool.dddddddddddd This dirt track racing is definitely different. ... Its tough. I would never have expected this. Im really happy for Mason Mitchell Motorsports. ... Its so cool to get those guys a win here.A crash on the backstretch inside of 10 laps between leader Josh Williams and Unzicker forced the final caution in the race that went 102 laps.Fike was second, followed Unzicker, 61-year-old former NASCAR driver Ken Schrader and season points leader Chase Briscoe.Considering how bad our car was at the beginning of the race, second feels like a win today, Fike said. We just couldnt get off (turn) four like we needed to. ... Loose in and loose off all day. Felt like the track got a little better the last 40 laps, and the restarts helped a bunch. 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