Boaz Weinstein’s main hedge fund gained 82% in the first quarter, as many of his peers struggled to navigate their way through the worst turbulence since the global financial crisis. Weinstein’s Saba Capital Management, which earlier this month had $2.2 billion of assets, extended its climb from earlier in the year. Bets on credit default swaps and derivative trades on companies in the retail and energy sectors had already seen the fund rise rapidly in February.