CHICAGO -- Following two stints in the minors this season, Randal Grichuk is back in the majors and eager to prove he belongs.Grichuk hit a grand slam that capped a six-run burst in the eighth inning and the St. Louis Cardinals stopped the Cubs 11-game winning streak, beating Chicago 8-4 Saturday.After a run-scoring wild pitch and a bases-loaded walk with two outs in the eighth put the Cardinals ahead 4-2, Grichuk connected.It was his second homer since being recalled from Triple-A Memphis on Thursday -- and it came on his 25th birthday, no less.I feel like a lot of people let that opportunity slip away thinking theyre going to have many more, Grichuk said. Im definitely thankful for being up here right now and getting the opportunities, and Im definitely trying to take advantage of it.Brandon Moss and Jedd Gyorko also homered for St. Louis.Addison Russell hit his 14th homer for the NL Central-leading Cubs.Alex Reyes (1-0) pitched three scoreless innings of relief to get his first major league win in his second appearance.St. Louis starter Luke Weaver gave up two runs on four hits in his major league debut. The 22-year-old was lifted for a pinch hitter after four innings and 85 pitches.Carl Edwards Jr. (0-1) allowed five runs while getting only two outs.Chicago starter Kyle Hendricks struck out 12, matching a career best, in seven innings. He gave up five hits, including two homers. His ERA rose slightly from 2.17 to 2.19.Just two bad changeups, really, two changeups up (in the strike zone), Hendricks said. That was about it. Hopefully, we could keep that winning streak going, but well start a new one tomorrow.It was 2-all in the eighth when the Cardinals loaded the bases with one out. Edwards Jr. struck out Yadier Molina with a breaking pitch in the dirt and the ball bounced off the chest of catcher Willson Contreras and rolled toward the third-base dugout, allowing Stephen Piscotty to score.Edwards then walked the next two batters to force in another run. Joe Smith relieved and Grichuk hit his slam.It means a lot, Grichuk said. Its definitely a confidence booster. In Wrigley against the Cubs, a division rival, its definitely big and, hopefully, the confidence can carry over through the rest of the season.FUTURE ACES?With Weaver and Reyes, 21, the Cardinals have a pair of prized pitching prospects. Manager Mike Matheny was asked if he allowed himself to think about both being in the rotation next season while watching them on Saturday.I wont deny that that hit me at some point in that game, Matheny said. I even turned to (bench coach) Dave Bell and said, `This is really impressive stuff. These kids are making a nice first statement.You probably couldnt throw them into a hotter spot than what we just threw them into. This is a tough place to pitch and watching them . not just survive, I thought they looked terrific, he said.LA STELLA UPDATEThe Cubs are awaiting a decision from INF Tommy La Stella, who was put on the inactive list earlier this week after failing to report to Triple-A Iowa following a demotion last month. La Stella returned to his home in New Jersey.Im still very optimistic about him coming back, but nothing has really abruptly changed right now, manager Joe Maddon said. I think he was very clear how he felt. I think we were very clear back to him how we felt.TRAINERS ROOMCardinals: OF Matt Holliday (broken right thumb) was placed 15-day disabled on Saturday to make room for Weaver on the roster.Cubs: After a bullpen session Friday, RHP Hector Rondon (sore triceps) reported no physical complications. Maddon said the reliever was real close to a return to the active roster ... RHP Pedro Strop, who had an arthroscopic procedure to repair a meniscus tear in his left knee on Thursday, was back in the clubhouse on Saturday walking on crutches. Hes expected to be sidelined four to six weeks.UP NEXTCubs RHP John Lackey (9-7, 3.56 ERA) pitches the finale on Sunday. Lackey, who jumped from the Cardinals to the Cubs in the offseason, is 1-1 with a 2.70 ERA against St. Louis this season. RHP Mike Leake (8-9, 4.79) goes for the Cardinals. Jim Kelly Jersey . Ashley Youngs cross was inadvertently headed by Chester into his own net in the 66th minute, allowing United to claim a third straight league win. 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Changes could still be made as a result of a suspension or injury.Lewis Hamilton says he will never be happy just to participate in F1 and will continue racing as long as he has a chance to win. The reigning world champion, who turned 31 in January, is in his 10th season of F1 and the early months of a new three-year contract at Mercedes.A three-time world champion, Hamilton also stands third in the all-time list of F1 race victors, while only Michael Schumacher and Ayrton Senna have secured more pole positions. The Briton says his passion for racing - and winning - remains as strong as ever.The goal in racing is to excel in every opportunity I have still, Hamilton said during a select media briefing in Sochi. Lewis Hamilton: F1 and beyond Read our Q&A with the world champion on his past, present and future I still want to win championships, I still want to win races. I dont know why I still have the drive to do those things because Ive had quite a few of them, but its because its what I love doing.So I will continue to do it while I love it - and not just to be in it, to win it. Im not here just to participate. I never have been and never will be. Where does Hamilton rank in F1 history? Lewis Hamilton Hamilton rank Most in F1 Wins 43 3rd 91 - Michael Schumacher Pole positions 51 3rd 68 - Michael Schumacher Podiums 90 4th 155 - Michael Schumacher Fastest laps 28 =5th 77 - Michael Schumacher Front-row starts 92 2nd 116 - Michael Schumacher Points 1,924 2nd 1,929 - Sebastian Vettel World titles 3 =5th 7 - Michael Schumacher Hamiltons father, Anthony, told Sky Sports in February he thought his son had seven to 10 years left in the sport.ddddddddddddThe three-time title winner will be a month away from his 34th birthday when his Mercedes contract expires at the end of 2018 and, although he has already indicated he will continue in F1 beyond that point, Hamilton admits he is unsure just how long his career will run.It could end soon, or it could go long, who knows how long its going to go on, Hamilton added. The cool thing is nothings planned - its the unknown. So do I feel I can drive as I do now in 10 years time? As long as I keep myself fit Im pretty certain I can. Do I want to drive? Time will tell.Hamiltons unsated ambition was apparent in adversity last weekend in Russia when the Mercedes drivers frustration at being denied a shot at victory was etched across his demeanour throughout.Either hes in for an Oscar or hes doing a very good impression of being crestfallen. That impresses me enormously that Lewis is taking so much pain, remarked Sky F1s Martin Brundle. Lewis Hamilton quells rumours that the Mercedes team changes are to blame for poor fortune Hes got three world championships in his pocket, its not always going to go his way, and its like hes fighting for his first. His chin is down a bit and hes taken all this as body blows whereas it would probably be very easy to say okay, maybe this is not my year - I will win it again next year.He is treating it like its his first-ever world championship. Dont miss the F1 Report for all the analysis of the Russian GP at 8:30pm on Wednesday on Sky Sports F1. Natalie Pinkham is joined in the studio by Sky Sports F1s David Croft and Marc Priestley. Every 2016 race live Fast and easy upgrade to watch every F1 session live on Sky Sports Also See: Hamilton expects 2016 grid penalty The Formula 1 gossip column ' ' '