Filipina tennis ace Alex Eala stretched her win streak on grass after repeating over Thai Mananchaya Sawangkaew, 6-3, 6-2, to march into the semifinal of the WTA 125 Birmingham Open in the United Kingdom early Saturday, June 6 (Philippine time).In the all-Southeast Asian quarters duel, the 21-year-old Eala, the tournament’s No. 1 seed, emerged victorious after outservicing – off 44-24 service points – and outpointing – 71-51 points won – Sawangk…