Lauren James received her first call-up to the England senior squad this season
Teenager Lauren James scored as Manchester United claimed victory over struggling West Ham on a historic day that saw Old Trafford host a Women's Super League match for the first time.
James, 19, rose to flick home Maria Thorisdottir's header from a corner to make it 1-0 just after the break.
USA forward Christen Press thumped in a second after she was slipped through by Jackie Groenen six minutes later.
United, who usually play at Leigh Sports Village, sit third in the table.
James, one of England's most promising youngsters, was excellent in the first half and was rewarded for her fine performance when she became the first woman to score at Old Trafford just five minutes after the restart.
She has now scored the first goal for Manchester United women in the Championship, the WSL, the FA Cup and now at Old Trafford.
James showed skill, intelligence and pace throughout, coming close again in the second half when her curling strike flew inches past the right post.
Before her opener, the hosts were struggling to break down West Ham, who remain bottom of the table and without a win in seven WSL matches.
Press had opportunities to score and twice fizzed balls across the six-yard area which evaded James and midfielder Ella Toone.
Sloppiness in possession almost proved costly for the hosts too as West Ham's Martha Thomas, Kenza Dali and Dagny Brynjarsdottir all had chances to get in behind the home defence in the first half after being gifted the ball.
The Hammers were made to pay for not taking their chances though as James and Press provided the clinical edge Manchester United had craved, before Laura Vetterlein's second yellow card made life even harder for the visitors in the final stages.
The result leaves Casey Stoney's side six points above Arsenal, who take on north London rivals Spurs at the Tottenham Hotspur Stadium later on Saturday (15:30 GMT).
West Ham are one point below Bristol City, who face fellow relegation rivals Birmingham City on Sunday (16:00 GMT).
Line-upsMatch StatsLive Text
Man Utd Women
27Earps3Thorisdottir4Turner21Turner17Batlle14Groenen10Zelem7Toone37Staniforth16James24Press27Earps3Thorisdottir4TurnerBooked at 61mins21Turner17BatlleBooked at 67minsSubstituted forHarrisat 74'minutes14Groenen10ZelemSubstituted forLaddat 65'minutesBooked at 90mins7Toone37StaniforthSubstituted forHansonat 66'minutes16JamesSubstituted forRossat 84'minutes24PressSubstituted forSigsworthat 84'minutesBooked at 90mins
West Ham Women
18Brosnan22Fisk5Flaherty26Vetterlein2Redisch Kvamme12Longhurst32Brynjarsdóttir10Svitková21Dali25van Egmond9Thomas18Brosnan22Fisk5Flaherty26VetterleinBooked at 77mins2Redisch KvammeSubstituted forBarkerat 89'minutes12Longhurst32BrynjarsdóttirSubstituted forCissokoat 84'minutes10Svitková21DaliSubstituted forMustafaat 88'minutes25van Egmond9ThomasSubstituted forPachecoat 78'minutes
Home TeamMan Utd WomenAway TeamWest Ham WomenPossessionHome74%Away26%ShotsHome16Away10Shots on TargetHome5Away5CornersHome9Away3FoulsHome10Away7
Match ends, Manchester United Women 2, West Ham United Women 0.