MEXICO CITY, Mexico -- Toto Wolff says Mercedes has a responsibility not to let team strategy calls influence the title battle between Lewis Hamilton and Nico Rosberg as the team chases victory at Sundays Mexican Grand Prix.The two Mercedes drivers will start on the front row of the grid on soft tyres but are likely to come under attack from the Red Bulls of Max Verstappen and Daniel Ricciardo, which are both starting on the faster super-soft tyre and have showed impressive pace this weekend. Hamilton and Rosberg are likely to attempt one-stop strategies based on their decision to start on softs, while Verstappen and Ricciardo could go for an aggressive two-stop to put pressure on the two title protagonists.Wolff admitted the Mercedes pit wall could face a tough balance between wanting to beat Red Bull on Sunday and providing Hamilton and Rosberg an even strategic playing field to do battle on.Yes we have quite a big responsibility towards the two, he said. We want to win the race but sending them on two different strategies and not knowing which one is the right one can potentially have an outcome which needs an explanation.Weve had this in the past years that we will ask questions why did you send Driver B on that strategy but it was clear that was the better one. If we split the strategies it will be to win, and because we simply dont want to know which one is the better one. So to answer your question, there is responsibility and weight on our shoulders in trying to get it right and as balanced as possible.Despite the tyres performing in an unpredictable manner so far this weekend, Wolff has confidence in Mercedes strategists, who have rarely made a mistake this year.Weve seen situations where weve not been completely clear which tyre is going to last, how graining or blistering is going to happen and when and how much the tyres need management to take them further.We have had that all through the season and the same is tomorrow, the track temperatures have a big influence on the performance and behaviour of the tyre so that is pretty much one of the major variables of the race which you need to get right. It includes a lot of data, algorithms and common sense. Weve been ok so far with getting it right often, but there is no guarantee that it will be like this ever. Buy Nike Presto . 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Anthony Calvillo, through 20 CFL seasons, was frequently invincible and largely stoic in the heat of competition. But underneath the professional exterior he was, and is, compellingly human. KANSAS CITY, Mo. -- Delino DeShields is known for his speed, stealing 101 bases in 2012 in the minors, not for his power.DeShields homered in the seventh inning to break a tie and the Texas Rangers defeated the Kansas City Royals 2-1 on Sunday.DeShields, who was recalled Thursday from Triple-A Round Rock, walked and doubled before leading off the seventh with his third home run. DeShields hit a 2-1 pitch from Luke Hochevar out to left.It so happened that today I was the guy that got us the go-ahead run, DeShields said. I was just trying to hit the ball hard. I wasnt looking for anything specific. I wanted to get on base. Before I had gotten on base in every at-bat.With the game tied and if I get myself in scoring position, theres a good chance for me to touch home plate. I got into it pretty good and got it over the fence, but the main focus was just putting the barrel on the ball and try to get on base.The loss dropped the Royals to 48-49, the first time the World Series champions have been below .500 since May 15 when they were 18-19. The Royals have lost 13 of 19 games in July.Left-hander Alex Claudio (2-1) picked up the win, pitching a scoreless sixth.Hochevar (2-3) took the loss and has allowed six runs in 6 1/3 innings in July.It was a four-seam fastball and it just took off and ran back over the plate, Hochevar said of DeShields home run. Trying to go down and away with that and it just ran middle.Rangers relievers Claudio, Keone Kela, Jake Diekman and Sam Dyson held the Royals scoreless the final four innings.Dyson earned his 20th save in 22 opportunities, but not before allowing two singles and taking Paulo Orlandos liner off his right shoulder.After stranding runners at third base in the third, fourth and fifth innings, the Rangers broke through with a clutch hit in the sixth when Mitch Morelands two-out single scored Adrian Beltre, who began the inning with a single.Royals starter Edinson Volquez left after six innings and 91 pitches, allowing one run and seven hits, while walking three and striking out three. It was Volquezs fifth straight start pitching at least six innings and he has a 2.87 ERA in that span.There were scouts watching Volquez, who is eligible for free agenccy after this season and could be traded at the deadline.dddddddddddd.He pitched in and out of trouble all day long, a fantastic job, Royals manager Ned Yost said.Rangers right-hander A.J. Griffin left after allowing four hits in five innings, including Kendrys Morales home run in the fourth inning. Morales had three of the Royals seven hits.I tried to keep them off balance as well as I could, Griffin said. Its a good team win. Delino had a great day. I think it was good step forward for the whole team and something to build on.The Rangers won back-to-back games for the first time since June 27-28.PEREZ RESTEDC Salvador Perez was not in the Royals lineup for the first time since July 3 with Drew Butera behind the plate with a day game after a night game. Perez was in a 2-for-23 skid with eight strikeouts and no walks over six games before delivering a pinch single in the ninth.RETURNING HOMEThe Rangers wrapped up a nine-game, 10-day trip Sunday and play their next seven at Globe Life Park. They have played only four home games in the past 28 days from June 27 to July 24.RANGERS SIGN BRESLOWLeft-hander Craig Breslow, who was released Monday by the Marlins, has signed a minor league contract with the Rangers and assigned to Triple-A Round Rock. Breslow, 35, is 22-29 with a 3.35 ERA in 539 games in the majors with San Diego, Boston, Cleveland, Minnesota, Oakland, Arizona and Miami.TRA