e TSN. NEW YORK -- Maybe Serena Williams simply wanted to put on a better show for her pal Beyonce.Looking rather displeased with herself at tim

The Oakland Raiders are displaying that they plan to be a factor in the AFC West.The San Diego Chargers cant say the same because of a penchant for blowing fourth-quarter leads.San Diego (1-3) has blown three leads in the games final five minutes and aims to halt a nine-game division losing streak when it visits the Raiders on Sunday (4:25 p.m., CBS).While the Chargers couldnt figure out how to protect another lead, Oakland (3-1) rallied for a road victory in Baltimore last Sunday, revealing the clutch gene that San Diego seems to lack.Raiders quarterback Derek Carr tossed a 23-yard touchdown pass to receiver Michael Crabtree with 2:12 remaining to provide Oakland with a 28-27 victory. Coach Jack Del Rio sees the comeback as another sign of the progression of Carr, who threw four touchdown passes in the win.He is a guy that is very well-prepared, Del Rio said. Hes really, I think, taken a step forward in terms of emotional control, the poise to be, kind of, surgeon-like and just be accurate with the ball and let his playmakers do their thing.So, its a combination of things but I think hes definitely taken a step forward for us.Meanwhile, San Diego is heading backwards as it cant close out games under beleaguered coach Mike McCoy.The Chargers blew a 13-point lead while losing to New Orleans 35-34 last Sunday. Running back Melvin Gordon and receiver Travis Benjamin each lost fourth-quarter fumbles to set the stage for the teams latest collapse.San Diego also let fourth-quarter leads get away in losses to Kansas City and Indianapolis.Theres 53 minutes of some good football and then unfortunately we turned the ball over twice there to give them a great opportunity to do what they did, McCoy said of the Saints game. Youre furious when you watch because you see all the positives, but then theres the blowups.We can put it on two plays, but thats not the only reason. Theres a number of times during the games. Like I told the players, thats every week. Theres so many things we can do better.The setbacks have increased speculation that McCoys job is in jeopardy, but the fourth-year coach said he isnt worried about being dismissed.San Diegos injury-riddled roster took another hit Wednesday, when Pro Bowl cornerback Jason Verrett said he would miss the rest of the season with a partially torn ACL in his left knee.The feeling I had in my knee, I knew something wasnt right but I have the mindset of being out there, Verrett said. Then getting the results, it was crushing. It was tough, but I knew something wasnt right.The loss of Verrett and the probable absence of veteran cornerback Brandon Flowers (concussion) will make it harder for the Chargers to halt the Oakland passing game.Carr has passed for 1,066 yards, nine touchdowns and one interception. Crabtree, who has 26 catches for 308 yards, had a career-best three touchdowns against the Ravens and is tied for the NFL lead with four scoring receptions.He was so committed to making sure he made so many plays for me that I would always look his way -- thats what he wants and so far, hes done that, Carr said. You have to give him credit. The guys worked his tail off and hes super competitive to get to where hes at to where if its one-on-one, hes a great matchup.The Raiders have struggled on the defensive side and are allowing a league-worst 460.0 yards per game. Standout defensive end Khalil Mack finally recorded his first sack of the season against Baltimore after posting 15 last season.San Diego quarterback Philip Rivers has passed for 1,110 yards, seven touchdowns and one interception despite losing standout receiver Keenan Allen (knee) for the season. Gordon leads the NFL with six rushing touchdowns after not finding the end zone as a rookie, but he is averaging a paltry 3.2 yards per carry.First-round pick Joey Bosa, the defensive end from Ohio State, is expected to make his NFL debut for the Chargers.San Diegos most-recent win over an AFC West foe came against the Raiders 13-6 on Nov. 16, 2014. The Chargers lost their final two division games that season, went 0-6 versus the AFC West last season, and lost to Kansas City in this seasons opener.The Raiders averaged 30 points while sweeping last seasons two meetings. 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NEW YORK -- Maybe Serena Williams simply wanted to put on a better show for her pal Beyonce.Looking rather displeased with herself at times, including when she shook her head and smirked on the way to the net for a post-victory handshake Thursday night, Williams still managed to tie Martina Navratilovas professional-era womens record with her 306th career victory in Grand Slam matches.Williams beat Vania King 6-3, 6-3 to reach the U.S. Opens third round.I just think it should have been a different scoreline for me. I feel like I made a lot of errors, Williams said. But, you know, theres nothing I can do about that now. What really matters is I got the win. Hopefully Ill just get better.Really? This performance didnt seem OK? After all, Williams delivered 13 aces with serves that reached 121 mph. She compiled a 38-4 edge in winners. She only dropped six games and needed all of 65 minutes to win.I just didnt have a great day, was her assessment.Yes, there were problems. The 28 unforced errors The return game: She won only 13 of 40 points on Kings first serves. Williams did, however, smack one backhand return winner in the final game.Music power couple Beyonce and Jay Z sat behind Williams coach, Patrick Mouratoglou, in the players guest box Thursday.Its always good, Williams said casually, to have Beyonce and Jay in the box.King noticed Williams negative body language as she headed to the net.I think Serenas a perfectionist. She always wants to play her best. ... If she doesnt play really well, shes always a little bit hard on herself, King said.Delivering 13 aces with the roof closed at Arthur Ashe Stadium, and showing nno signs of a sore right shoulder that she said requires constant treatment, Williams improved to 306-42 in matches at major tournaments, a winning percentage of .dddddddddddd.879. Navratilova retired with a 306-49 mark.Only Roger Federer, with 307, has won more Grand Slam matches than Williams in the Open era, which dates to 1968 -- and he wont add to that total during this tournament because he is out for the season as he rehabs his surgically repaired left knee. Williams can equal Federers total by beating 47th-ranked Johanna Larsson of Sweden on Saturday.Would like to take one more step, Williams said while discussing her Slam win total. After a pause, she added: several more steps.Thats because itll take five more victories to win the championship, which would be her seventh at the U.S. Open and 23rd overall at majors, breaking Steffi Grafs Open-era record in that category.Never one to shy away from non-tennis interests, Williams recently appeared in one of Beyonces music videos and introduced a performance by her at the MTV Video Music Awards in Manhattan on Sunday night.Usually when people are there, I try to play better, especially if theyre famous and theyre doing so great at their job, Williams said. Its like I want to show them that Im good at my job, too.Williams then tacked on two words at the end of that thought -- minus today -- just to be sure everyone understood how she felt about this particular outing.---Follow Howard Fendrich on Twitter at http://twitter.com/HowardFendrich ' ' '