Croatia close on qualification
Croatia took control of Group E by beating Hungary 3-0 in Split, while Slovakia jumped into second despite being held to a 1-1 home draw by Wales.
Luka Modric's fifth-minute strike and two goals for Bruno Petkovic sent last year's World Cup runners-up Croatia four points clear of third-placed Hungary.
Slovakia fell behind in the first half when former lifeguard Kieffer Moore scored on his international competitive debut for Wales, but secured a draw thanks to Juraj Kucka's brilliant 53rd-minute volley.
Elsewhere, Robert Lewandowski netted a hat-trick, taking his tally this season to 18 goals for club and country, as Poland won 3-0 at Latvia to strengthen their position at the top of Group G.
They sit three points clear of closest challengers Austria, who saw off Israel 3-1, while North Macedonia are two points further back after a 2-1 victory against Slovenia.