Gabriel Martinelli missed from the spot as Arsenal crashed out of the Europa League after a penalty shootout loss to Sporting.A 2-2 draw in Lisbon a week ago left this last-16 tie finely poised and it would go all the way at the Emirates Stadium, Sporting advancing 5-3 on penalties following a 1-1 draw after extra-time.The visitors were perfect from 12 yards but Martinelli's tame effort was saved in the first ever shoot-at the Emirates.As Kim Kardashian watched on, the reality for Arsenal is that all their hopes of a trophy this season now rest on their Premier League title charge, which continues at home to Crystal Palace on Sunday.Granit Xhaka's first goal since October had Arsenal ahead but they failed to build on that advantage before conceding a spectacular equaliser, reminiscent of the goal Nayim scored against the Gunners in the 1995 Cup Winners' Cup final as Pedro Goncalves struck from over 49 yards out.Substitute Leandro Trossard saw a shot turned onto the woodwork in the first half of extra-time before Manuel Ugarte was sent off, shown a second yellow for a lunge on Bukayo Saka.The pressure ramped up in the shootout as the first seven takers all converted before Martinelli failed to do so, allowing Nuno Santos to smash home the decisive kick.Mikel Arteta named a strong XI despite fighting on two fronts, with the Premier League title race no doubt his top priority as the Gunners sit five points clear at the summit - Gabriel Jesus back in the starting line-up for the first time since returning from knee surgery.He lost Takehiro Tomiyasu to injury with less than 10 minutes on the clock as he limped off to be replaced by Ben White.Jesus had his first sight of the Sporting goal with 15 minutes on the clock but could