RIO DE JANEIRO -- Michael Phelps has to clear out more space in his medal case.Time to make room for gold No. 19.With yet another dazzling performance, the most decorated athlete in Olympic history added to his staggering haul Sunday night in the 4x100-meter freestyle relay, giving the United States a lead it never relinquished.Defending Olympic champion France was leading when Phelps dove into the water on the second leg, taking over for leadoff swimmer Caeleb Dressel. Even though the 100 free isnt one of his specialties -- hes never swam it at the Olympics -- he blazed down and back in a stunning 47.12 seconds, a time that was faster than all but the three anchors on the medal-winning teams, three of the best in the world at that distance.Ryan Held protected the lead before giving way for Nathan Adrian, Americas best sprinter.At that point, it wasnt really in doubt.But Phelps wasnt taking any chances, pounding the starting block and shouting toward Adrian as the anchor made the turn for home.When Adrian touched the wall first, posting a winning time of 3 minutes, 9.92 seconds, Phelps thrust his right arm in the air and looked toward his infant son Boomer, nuzzling in the arms of his mother Nicole Johnson, the roaring crowd blocked out by noise-canceling headphones.Little Boomer wont remember what his daddy did this night.But that gold medal will never let him forget.France took the silver in 3:10.53, while Australia claimed the bronze in 3:11.37, holding off a Russian team that was booed during the introductions -- a reminder of the drug scandal that has rocked the nation. Vladimir Morozov, initially banned from the Olympics, was one of Russias relay swimmers.It was quite a night for the Americans, who were shut out on the golds on the opening night of swimming.Racing nothing but the clock, Katie Ledecky gave the U.S. its first victory by crushing her own world record in the 400 freestyle.The result was totally expected. The unassuming teenager from suburban Washington has dominated the longer freestyle events since winning gold in the 800 free at the London Olympics as a 15-year-old.The only drama was whether shed take the world record even lower.Her powerful stroke quickly made that a moot point, too.Ledecky kicked off the first wall with a lead of nearly a body length and steadily pulled away from the overmatched field -- as well as the world-record line superimposed on the video screen.Her arms churning effortlessly through the water, Ledecky touched nearly 5 seconds ahead of her closest pursuer and quickly whipped around to look at the scoreboard.When Ledecky saw the time -- 3:56.46 -- she let out an uncharacteristic scream and shook her right fist. She crushed the mark of 3:58.37 that she set nearly two years ago on the Gold Coast of Australia, and had been chasing ever since.I was pumped, Ledecky said. Thats what I wanted and I had been so close to breaking that all year, the past two years. I knew I was due for a breakthrough.Shes just getting warmed up.Ledecky, who added gold to the silver she won in the womens 4x100 free relay, is also favored in other two individual events: the 200 and 800 free. In addition, she could pick up another gold in the 4x200 free relay.It was a night of world records in Rio.Britains Adam Peaty set his second mark in as many nights in the 100 breaststroke, while Sarah Sjostrom of Sweden eclipsed her own mark in the 100 butterfly.Peaty won with a time of 57.13 that shattered the mark of 57.55 he set in the preliminaries. He cruised away from Cameron van der Burgh of South Africa, the defending Olympic champion who took silver this time in 58.69. The bronze went to Cody Miller of the United States, whose time of 58.87 held off teammate Kevin Cordes.The crowd went into a frenzy at the sight of two Brazilians in the final. But Joao Gomes finished fifth and Felipe Franca was seventh.Sjostrom led right from the start of the fly and touched in 55.48, knocking off the mark of 55.64 she established at last years world championships. She sat on the edge of the deck, pumping her arms in the air, and then appeared to be overcome by tears as she climbed to her feet.This was her first Olympic medal. Sjostrom finished fourth in the 100 fly at the London Games four years ago, missing out on the bronze by just 23-hundredths of a second.Penny Oleksiak of Canada took the silver in 56.46, edging out defending Olympic champion Dana Vollmer. The American, who had her first child 17 months ago, settled for the bronze in 56.63.Already, six world records have been set in Rio.The only mark that didnt fall Sunday was the mens 4x100 free relay.Phelps and the Americans didnt mind a bit.---Follow Paul Newberry on Twitter at www.twitter.com/pnewberry1963 . His work can be found at http://bigstory.ap.org/content/paul-newberry . 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SPREAD -- San Diego 6-4-0, Houston 5-4-1SERIES RECORD -- Chargers lead 4-1LAST MEETING -- Texans beat Chargers 31-28, Sept. 9, 2013LAST WEEK -- Chargers had bye, lost to Dolphins 31-24 on Nov. 13; Texans lost to Raiders 27-20AP PRO32 RANKING -- Chargers No. 23, Texans No. 13 (tie)CHARGERS OFFENSE -- OVERALL (8), RUSH (18), PASS (5).CHARGERS DEFENSE -- OVERALL (21), RUSH (5), PASS (28).TEXANS OFFENSE -- OVERALL (28), RUSH (4), PASS (30).TEXANS DEFENSE -- OVERALL (5), RUSH (21), PASS (4).STREAKS, STATS AND NOTES -- San Diego QB Philip Rivers has 11 TDs and two INTs in past three games against Houston. ... RB Melvin Gordon has 377 yards rushing and touchdown in last three games. Is tied for third in NFL with 11 touchdowns. ... WR Tyrell Williams has 10 catches for 25 yards or more, which ranks fourth in NFL. ... TE Antonio Gates looks for fourth straight game with TD catch. His 109 career TD catches rank second by tight end in NFL history... 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