Luke Littler found a double six in Frankfurt that sent England sliding toward the quarter-finals of the World Cup of Darts, and in that single moment of precision, he and Luke Humphries proved once again why they rank as the world's top two players—even when performing at just a fraction of their fearsome best.

The English pairing seized a commanding 3-0 lead early in their opening match against Spain's Cristo Reyes and Jose Justicia, but the unseeded Spanish team fought back to keep the pressure on. The match tightened, played leg for leg, until Littler's decisive finish at the double six pushed England ahead 6-4. That double was all the separation needed. Humphries and Littler closed out the match 8-5, advancing to Sunday's quarter-finals to face Wales—a team that only weeks ago might have looked intimidating, but now stands squarely in England's path as number one seeds.

What makes this victory particularly notable is its modesty. This wasn't England firing on all cylinders. Humphries, speaking to Sky Sports after the match, was refreshingly candid about his and Littler's performance. "That was probably about six out of 10," he said. "We knew it was going to be that way, that we wouldn't average what we do in the Premier League. I'm proud of the way we fought back. It wasn't the worst performance in the world. It wasn't our best, but having got through our first game we can relax and play how we know we can tomorrow."

That measured assessment carries weight in professional darts, where consistency and mental resilience often matter as much as raw brilliance. England had entered the tournament as number one seeds in the second round—a privilege that also carries the burden of expectation. Last year, shockingly, Humphries and Littler fell at this same stage to Germany, a loss that would have stung. Now, with a workmanlike victory in hand and stronger opponents ahead, they have the chance to make amends.

Wales, seeded seventh, earned their quarter-final berth by defeating the United States 8-5, with Jonny Clayton and Nick Kenny delivering the victory. But the English pair's path through the tournament brackets remains promising. Defending champions Northern Ireland—Josh Rock and Daryl Gurney, seeded third—narrowly beat Belgium 8-7 in a tense opener and will face Latvia, who defeated France by the same margin. Scotland's Gary Anderson and Cameron Menzies, seeded fourth, opened with a dominant 8-0 thrashing of Norway and will take on Ireland, who advanced past Poland 8-5 with William O'Connor and Mickey Mansell. The Netherlands and Germany round out the quarter-final lineup after victories over the Czech Republic (8-6) and Sweden (8-6) respectively.

Sunday's tournament concludes with the quarter-finals and semi-finals, each contested over 15 legs, before a decisive 19-leg final. For Humphries and Littler, the path is clear: they have the skill and ranking to dominate this competition, but they'll need to bring the sharper version of themselves that made them the world's elite. Against Wales, they'll have the chance to prove that six-out-of-ten performances, when played with intelligence and grit, are good enough to advance—and that their best is still to come.