SEATTLE -- Just two months removed from Double-A,?Edwin Diaz has been named the Seattle Mariners closer, replacing struggling Steve Cishek.Diaz struck out three and walked one in picking up his first major league save Tuesday night against the?Boston Red Sox.Manager Scott Servais announced the decision to make Diaz his new closer prior to Tuesdays 5-4 Mariners win. Cishek blew a three-run lead Sunday in a loss to the Cubs, then allowed a tie-breaking homer to Mookie Betts in the ninth inning of a loss to Boston on Monday.Diaz was promoted from Jackson on June 4 and has a 1.73 ERA in 25 appearances. The 22-year-old right-hander has struck out 52 and walked eight over 26 innings. He has held opponents scoreless in 21 of his appearances, including Tuesdays.?I like to pitch under pressure. I feel more confident when its a close game, he said. I dont know why, but I feel really, really good.Diaz has thrown 9? consecutive scoreless innings.I will do the same job I do in the seventh or eighth: Get three outs, and try to win the games, he said.Servais told Diaz and Cishek of the switch after Mondays 2-1 loss.He looks like hes ready to go, Servais said of Diaz.Servais said other relievers, including Cishek, might still be called on to close out games. Right now, though, Diaz is the go-to arm in save situations.He hasnt backed off. He has been very aggressive, Servais said. He believes he belongs in this league. He certainly has produced at a level like he should believe he belongs here.Diazs fastball has peaked at 101.8 mph this season, according to BrooksBaseball.net, and he throws a slider. Diaz credits veteran reliever Joaquin Benoit with helping him adjust to the big leagues. Benoit was traded to Toronto on July 26.Every start, I learn something new, Diaz said. I try to put it into the next start. 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Lewis Hamilton says only the Malaysian Grand Prix will reveal whether the advantage teammate Nico Rosberg had in Singapore is likely to become a trend.Hamilton struggled to find the a quick set-up in Singapore after losing track time in practice to a hydraulic leak. Meanwhile, Rosberg nailed his set-up early in the weekend and went on to beat Hamilton in qualifying by 0.704s - the largest margin he has had over Hamilton since the two became teammates in 2013.Hamilton was unable to explain the issue when asked during his media session on Saturday night in Singapore, and after finishing a distant third on Sunday evening was still unsure if the problem was just a blip or the start of a trend.The next race will tell, he said. I am not really thinking too much about it at the moment.Nico just did an exceptional job in Singapore and we didnt. What it is going to take [to get back on top]? Just some good weekends, which we have had in the past.While Hamilton was reluctant to talk about the issues, team boss Toto Wolff gave some insight into the problems his driver faced.He just started on the wrong foot and couldnt recover, Wolff said. In Singapore, if you are lacking laps in free practice and lacking direction on where to take the set-up it is a vicious circle. Confidence is key around Singapore and if your teammate gets out of the blocks the way he did then it becomes very difficult.dddddddddddd I think Lewis is the first one to acknowledge that.In the past drivers have copied their teammates set-up when they have struggled, but Wolff said that would have represented too big a risk for Hamilton in Singapore.You cannot just guess and the approach he choose was probably right. He stayed where he was without deciding on a particular avenue because he just simply didnt know. That was down to the lack of running.Rosberg has now won three races in a row, while Hamillton has had to settle for two third places and a second place since the summer break. But Wolff warns against drawing too many conclusions from the most recent results.We have the tendency of talking one driver up and the other one down, and we have had that for three years since the two of them have been fighting for the championship. We have seen those waves and I remember talking about Lewis momentum a few weeks ago and then suddenly we had this mega Nico weekend and in two weeks we are going to see if that changes or stays the same in Malaysia. ' ' '