STOCKHOLM, Sweden, May 14 : Few coaches have experienced the highs and lows that Graham Potter has this season, which started with his sacking by Premier League club West Ham United in September and will end with him leading Sweden at the World Cup in June.  The Englishman's dismissal after one win in five Premier League games at West Ham was quickly followed by his appointment as Sweden coach in October. Any residual disappointment was blown away at the end of March when a late Viktor Gyokeres